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2004 GMC Sierra 2500 HD
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2004 GMC Sierra 2500 HD

2004 GMC Sierra 2500 HD Catalytic Converters

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No Returns Accepted - Catalytic Converter, CARB and Federal EPA Standards, 50-state Legal, Semi-Universal (Welding Required)
Magnaflow®
No Returns Accepted - Catalytic Converter, CARB and Federal EPA Standards, 50-state Legal, Semi-Universal (Welding Required)
Part Number: M66447209
Guaranteed to Fit
$390.00
Vehicle Fitment
  • 2004 GMC Sierra 2500 HD Base 8 Cyl 8.1L EO# D-193-103; Eng Fam No: 4Gmxt08.1201; Cutting And Welding Required
  • 2004 GMC Sierra 2500 HD SLE 8 Cyl 8.1L EO# D-193-103; Eng Fam No: 4Gmxt08.1201; Cutting And Welding Required
  • 2004 GMC Sierra 2500 HD WT 8 Cyl 8.1L EO# D-193-103; Eng Fam No: 4Gmxt08.1201; Cutting And Welding Required
  • 2004 GMC Sierra 2500 HD SLT 8 Cyl 8.1L EO# D-193-103; Eng Fam No: 4Gmxt08.1201; Cutting And Welding Required
Product Details
Location : RearEmissions : CARB and Federal EPA Standards, 50-state LegalNotes : 3 in. Inlet/Outlet; 13 in. overall lengthType : Catalytic ConverterProduct Fit : Semi-Universal (Welding Required)Recommended Use : OE ReplacementQuantity Sold : Sold individuallyEO Number : D-193-103Gasket Included : Without GasketWarranty : Magnaflow 5 year / 50,000 Mile WarrantyReturns Policy : NON-RETURNABLEProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Promotions : Magnaflow Catalytic Converter SaleSeries : California SeriesTube Material : Stainless Steel
Front, Passenger Side Exact Fit Series Catalytic Converter, Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)
Davico®
Front, Passenger Side Exact Fit Series Catalytic Converter, Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)
Part Number: DAV19430
Guaranteed to Fit
$359.99
Vehicle Fitment
  • 2004 GMC Sierra 2500 HD SLE 8 Cyl 8.1L With California Emission; Oe Is Welded Assembly. Cut To Fit.; Gvw 10,000 - 14,000
  • 2004 GMC Sierra 2500 HD SLT 8 Cyl 6.0L With California Emission; Oe Is Welded Assembly. Cut To Fit.; Gvw 10,000 - 14,000
  • 2004 GMC Sierra 2500 HD WT 8 Cyl 8.1L With California Emission; Oe Is Welded Assembly. Cut To Fit.; Gvw 10,000 - 14,000
  • 2004 GMC Sierra 2500 HD Base 8 Cyl 6.0L With California Emission; Oe Is Welded Assembly. Cut To Fit.; Gvw 10,000 - 14,000
  • 2004 GMC Sierra 2500 HD SLE 8 Cyl 6.0L With California Emission; Oe Is Welded Assembly. Cut To Fit.; Gvw 10,000 - 14,000
  • 2004 GMC Sierra 2500 HD SLT 8 Cyl 8.1L With California Emission; Oe Is Welded Assembly. Cut To Fit.; Gvw 10,000 - 14,000
  • 2004 GMC Sierra 2500 HD WT 8 Cyl 6.0L With California Emission; Oe Is Welded Assembly. Cut To Fit.; Gvw 10,000 - 14,000
  • 2004 GMC Sierra 2500 HD Base 8 Cyl 8.1L With California Emission; Oe Is Welded Assembly. Cut To Fit.; Gvw 10,000 - 14,000
Product Details
Location : Front, Passenger SideEmissions : Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)Notes : Illegal for installation in NY on vehicles equipped with California emission systems; 50.25 in. overall lengthRestricted States : California|Colorado|New York|MaineType : Catalytic ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold individuallyGasket Included : With GasketOxygen Sensor Ports : Factory OEM PortsOxygen Sensor Port Location : Factory OEM LocationsWarranty : 25,000-mile Davico limited warranty on catalyst emission properties and 5-year or 50,000-mile limited warranty on tube, shell and weldsProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Series : Exact Fit SeriesTube Material : Aluminized Steel
Rear, Passenger Side Exact Fit Series Catalytic Converter, Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)
Davico®
Rear, Passenger Side Exact Fit Series Catalytic Converter, Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)
Part Number: DAV19286
Guaranteed to Fit
$464.49
Vehicle Fitment
  • 2004 GMC Sierra 2500 HD SLE 8 Cyl 8.1L With California Emission; Oe Is Welded Assembly. Cut To Fit.; Gvw 10,000 - 14,000; Outlet Fits Over 3"Od Pipe
  • 2004 GMC Sierra 2500 HD SLT 8 Cyl 6.0L With California Emission; Oe Is Welded Assembly. Cut To Fit.; Gvw 10,000 - 14,000; Outlet Fits Over 3"Od Pipe
  • 2004 GMC Sierra 2500 HD WT 8 Cyl 8.1L With California Emission; Oe Is Welded Assembly. Cut To Fit.; Gvw 10,000 - 14,000; Outlet Fits Over 3"Od Pipe
  • 2004 GMC Sierra 2500 HD Base 8 Cyl 6.0L With California Emission; Oe Is Welded Assembly. Cut To Fit.; Gvw 10,000 - 14,000; Outlet Fits Over 3"Od Pipe
  • 2004 GMC Sierra 2500 HD SLE 8 Cyl 6.0L With California Emission; Oe Is Welded Assembly. Cut To Fit.; Gvw 10,000 - 14,000; Outlet Fits Over 3"Od Pipe
  • 2004 GMC Sierra 2500 HD SLT 8 Cyl 8.1L With California Emission; Oe Is Welded Assembly. Cut To Fit.; Gvw 10,000 - 14,000; Outlet Fits Over 3"Od Pipe
  • 2004 GMC Sierra 2500 HD WT 8 Cyl 6.0L With California Emission; Oe Is Welded Assembly. Cut To Fit.; Gvw 10,000 - 14,000; Outlet Fits Over 3"Od Pipe
  • 2004 GMC Sierra 2500 HD Base 8 Cyl 8.1L With California Emission; Oe Is Welded Assembly. Cut To Fit.; Gvw 10,000 - 14,000; Outlet Fits Over 3"Od Pipe
Product Details
Location : Rear, Passenger SideEmissions : Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)Notes : 27.5 in. overall lengthRestricted States : California|Colorado|New York|MaineType : Catalytic ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold individuallyGasket Included : With GasketOxygen Sensor Ports : Factory OEM PortsOxygen Sensor Port Location : Factory OEM LocationsWarranty : 25,000-mile Davico limited warranty on catalyst emission properties and 5-year or 50,000-mile limited warranty on tube, shell and weldsProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Series : Exact Fit SeriesTube Material : Aluminized Steel
Driver Side Exact Fit Series Catalytic Converter, Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)
Davico®
Driver Side Exact Fit Series Catalytic Converter, Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)
Part Number: DAV19459
Guaranteed to Fit
$382.49
Vehicle Fitment
  • 2004 GMC Sierra 2500 HD SLE 8 Cyl 8.1L With Federal Emission
  • 2004 GMC Sierra 2500 HD SLT 8 Cyl 6.0L With Federal Emission
  • 2004 GMC Sierra 2500 HD WT 8 Cyl 8.1L With Federal Emission
  • 2004 GMC Sierra 2500 HD Base 8 Cyl 6.0L With Federal Emission
  • 2004 GMC Sierra 2500 HD SLE 8 Cyl 6.0L With Federal Emission
  • 2004 GMC Sierra 2500 HD SLT 8 Cyl 8.1L With Federal Emission
  • 2004 GMC Sierra 2500 HD WT 8 Cyl 6.0L With Federal Emission
  • 2004 GMC Sierra 2500 HD Base 8 Cyl 8.1L With Federal Emission
Product Details
Location : Driver SideEmissions : Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)Notes : 63 in. overall lengthRestricted States : California|Colorado|New York|MaineType : Catalytic ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold individuallyGasket Included : With GasketOxygen Sensor Ports : Factory OEM PortsOxygen Sensor Port Location : Factory OEM LocationsWarranty : 25,000-mile Davico limited warranty on catalyst emission properties and 5-year or 50,000-mile limited warranty on tube, shell and weldsProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Series : Exact Fit SeriesTube Material : Aluminized Steel
Passenger Side OEM Grade Series Catalytic Converter, Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)
Magnaflow®
Passenger Side OEM Grade Series Catalytic Converter, Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)
Part Number: M6621989
Guaranteed to Fit
$336.00
Vehicle Fitment
  • 2004 GMC Sierra 2500 HD SLT 8 Cyl 6.0L 153.0 in. Wheelbase
  • 2004 GMC Sierra 2500 HD Base 8 Cyl 6.0L 153.0 in. Wheelbase
  • 2004 GMC Sierra 2500 HD SLE 8 Cyl 6.0L 153.0 in. Wheelbase
  • 2004 GMC Sierra 2500 HD WT 8 Cyl 6.0L 153.0 in. Wheelbase
Product Details
Location : Passenger SideEmissions : Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)Notes : (1) Converter Quantity; 3 in. Main Piping Diameter; 8.75 in. Body Length x 5 in. Body Width x 5 in. Body Height; 3 in. ID x 3 in. OD; Round Body Shape; Spun Body Type; Bolt-On Inlet Attachment; Clamp-On Outlet Attachment; Stainless Steel Material; Post Converter; Includes Gasket; 23.25 in. overall lengthRestricted States : California|Colorado|New York|MaineType : Catalytic ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold individuallyGasket Included : With GasketOxygen Sensor Ports : Factory OEM PortsOxygen Sensor Port Location : Factory OEM LocationsWarranty : 5-year or 50,000-mile Magnaflow limited warranty on Construction; 25,000-mile Magnaflow limited warranty on EmissionsProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Series : OEM Grade SeriesTube Material : Stainless Steel
OEM Grade Series Catalytic Converter, Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)
Magnaflow®
OEM Grade Series Catalytic Converter, Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)
Part Number: M6651659
Guaranteed to Fit
$281.00
Vehicle Fitment
  • 2004 GMC Sierra 2500 HD SLT 8 Cyl 6.0L California Emissions Equipped Vehicles Registered Outside Of California; Low Emissions Vehicles (LEV)
  • 2004 GMC Sierra 2500 HD Base 8 Cyl 6.0L California Emissions Equipped Vehicles Registered Outside Of California; Low Emissions Vehicles (LEV)
  • 2004 GMC Sierra 2500 HD SLE 8 Cyl 6.0L California Emissions Equipped Vehicles Registered Outside Of California; Low Emissions Vehicles (LEV)
  • 2004 GMC Sierra 2500 HD WT 8 Cyl 6.0L California Emissions Equipped Vehicles Registered Outside Of California; Low Emissions Vehicles (LEV)
Product Details
Location : Front, Passenger SideEmissions : Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)Notes : 3 in. Inlet/OutletProduct Fit : Semi-Universal (Welding Required)Recommended Use : Performance ReplacementQuantity Sold : Sold individuallyGasket Included : Without GasketOxygen Sensor Ports : Factory OEM PortsOxygen Sensor Port Location : Factory OEM LocationsWarranty : Magnaflow 25,000 Mile Limited WarrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Series : OEM Grade SeriesTube Material : Stainless Steel
Front, Passenger Side OEM Grade Series Catalytic Converter, 8, 6.0 Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)
Magnaflow®
Front, Passenger Side OEM Grade Series Catalytic Converter, 8, 6.0 Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)
Part Number: M6652493
Guaranteed to Fit
$447.00
Vehicle Fitment
  • 2004 GMC Sierra 2500 HD SLT 8 Cyl 6.0L Low Emission Vehicle (Lev)
  • 2004 GMC Sierra 2500 HD Base 8 Cyl 6.0L Low Emission Vehicle (Lev)
  • 2004 GMC Sierra 2500 HD SLE 8 Cyl 6.0L Low Emission Vehicle (Lev)
  • 2004 GMC Sierra 2500 HD WT 8 Cyl 6.0L Low Emission Vehicle (Lev)
Product Details
Location : Front, Passenger SideEmissions : Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)Notes : (1) Converter Quantity; 3 in. Main Piping Diameter; 9 in. Body Length x 4 in. Body Width x 4 in. Body Height; 3 in. ID x 3 in. OD; Round Body Shape; Spun Body Type; Bolt-On Inlet and Outlet Attachment; Stainless Steel Material; Pre Converter; Includes Clamp, Hangers and Gasket; 49.38 in. overall lengthRestricted States : California|Colorado|New York|MaineType : Catalytic ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold individuallyGasket Included : With GasketOxygen Sensor Ports : Factory OEM PortsOxygen Sensor Port Location : Factory OEM LocationsWarranty : 5-year or 50,000-mile Magnaflow limited warranty on Construction; 25,000-mile Magnaflow limited warranty on EmissionsProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Series : OEM Grade SeriesTube Material : Stainless Steel
No Returns Accepted - Catalytic Converter, Federal EPA Standard, 46-State Legal (Cannot ship to or be used in vehicles originally purchased in CA, CO, NY or ME), Semi-Universal (Welding Required)
Magnaflow®
No Returns Accepted - Catalytic Converter, Federal EPA Standard, 46-State Legal (Cannot ship to or be used in vehicles originally purchased in CA, CO, NY or ME), Semi-Universal (Welding Required)
Part Number: M6660121
Guaranteed to Fit
$506.00
Vehicle Fitment
  • 2004 GMC Sierra 2500 HD SLE 8 Cyl 6.6L
  • 2004 GMC Sierra 2500 HD Base 8 Cyl 6.6L
  • 2004 GMC Sierra 2500 HD WT 8 Cyl 6.6L
  • 2004 GMC Sierra 2500 HD SLT 8 Cyl 6.6L
Product Details
Emissions : Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)Notes : Round body; 12 in. overall lengthRestricted States : California|Colorado|New York|MaineType : Catalytic ConverterProduct Fit : Semi-Universal (Welding Required)Recommended Use : OE ReplacementQuantity Sold : Sold individuallyGasket Included : Without GasketWarranty : Magnaflow 5 year / 50,000 Mile Limited WarrantyReturns Policy : NON-RETURNABLEProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Series : OEM Grade SeriesTube Material : Stainless Steel
No Returns Accepted - Catalytic Converter, Federal EPA Standard, 46-State Legal (Cannot ship to or be used in vehicles originally purchased in CA, CO, NY or ME), Semi-Universal (Welding Required)
Magnaflow®
No Returns Accepted - Catalytic Converter, Federal EPA Standard, 46-State Legal (Cannot ship to or be used in vehicles originally purchased in CA, CO, NY or ME), Semi-Universal (Welding Required)
Part Number: M6660120
Guaranteed to Fit
$506.00
Vehicle Fitment
  • 2004 GMC Sierra 2500 HD SLE 8 Cyl 6.6L DIESEL, With Duramax Engine
  • 2004 GMC Sierra 2500 HD Base 8 Cyl 6.6L DIESEL, With Duramax Engine
  • 2004 GMC Sierra 2500 HD WT 8 Cyl 6.6L DIESEL, With Duramax Engine
  • 2004 GMC Sierra 2500 HD SLT 8 Cyl 6.6L DIESEL, With Duramax Engine
Product Details
Emissions : Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)Notes : 3.5 in. Inlet/Outlet; 12 in. overall lengthRestricted States : California|Colorado|New York|MaineType : Catalytic ConverterProduct Fit : Semi-Universal (Welding Required)Recommended Use : OE ReplacementQuantity Sold : Sold individuallyGasket Included : Without GasketWarranty : Magnaflow 25,000 Mile Limited WarrantyReturns Policy : NON-RETURNABLEProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Series : HM Grade SeriesTube Material : Stainless Steel
Passenger Side HM Grade Series Catalytic Converter, Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)
Magnaflow®
Passenger Side HM Grade Series Catalytic Converter, Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)
Part Number: M6693479
Guaranteed to Fit
$517.00
Vehicle Fitment
  • 2004 GMC Sierra 2500 HD Base 8 Cyl 6.0L 133.0 in. Wheelbase, With 3 in. Diameter Outlet
  • 2004 GMC Sierra 2500 HD SLE 8 Cyl 6.0L 133.0 in. Wheelbase, With 3 in. Diameter Outlet
  • 2004 GMC Sierra 2500 HD WT 8 Cyl 6.0L 133.0 in. Wheelbase, With 3 in. Diameter Outlet
Product Details
Location : Passenger SideEmissions : Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)Notes : Gaskets Included; 49 in. overall lengthRestricted States : California|Colorado|New York|MaineType : Catalytic ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold individuallyGasket Included : With GasketOxygen Sensor Ports : Factory OEM PortsOxygen Sensor Port Location : Factory OEM LocationsWarranty : Magnaflow 25,000 Mile Limited WarrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Series : HM Grade SeriesTube Material : Stainless Steel
No Returns Accepted - Catalytic Converter, CARB and Federal EPA Standards, 50-state Legal, Semi-Universal (Welding Required)
Magnaflow®
No Returns Accepted - Catalytic Converter, CARB and Federal EPA Standards, 50-state Legal, Semi-Universal (Welding Required)
Part Number: M66447109
Guaranteed to Fit
$523.00
Vehicle Fitment
  • 2004 GMC Sierra 2500 HD SLE 8 Cyl 8.1L EO# D-193-103; Eng Fam No: 4Gmxt08.1201; Cutting And Welding Required
  • 2004 GMC Sierra 2500 HD WT 8 Cyl 8.1L EO# D-193-103; Eng Fam No: 4Gmxt08.1201; Cutting And Welding Required
  • 2004 GMC Sierra 2500 HD SLT 8 Cyl 8.1L EO# D-193-103; Eng Fam No: 4Gmxt08.1201; Cutting And Welding Required
  • 2004 GMC Sierra 2500 HD Base 8 Cyl 8.1L EO# D-193-103; Eng Fam No: 4Gmxt08.1201; Cutting And Welding Required
Product Details
Location : FrontEmissions : CARB and Federal EPA Standards, 50-state LegalNotes : 3 in. Inlet/Outlet; 13 in. overall lengthType : Catalytic ConverterProduct Fit : Semi-Universal (Welding Required)Recommended Use : OE ReplacementQuantity Sold : Sold individuallyEO Number : D-193-103Gasket Included : Without GasketWarranty : Magnaflow 5 year / 50,000 Mile WarrantyReturns Policy : NON-RETURNABLEProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Series : California SeriesTube Material : Stainless Steel
Passenger Side OEM Grade Series Catalytic Converter, Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)
Magnaflow®
Passenger Side OEM Grade Series Catalytic Converter, Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)
Part Number: M6649642
Guaranteed to Fit
$543.00
Vehicle Fitment
  • 2004 GMC Sierra 2500 HD Base 8 Cyl 6.0L 133.0 in. Wheelbase, With 3 in. Diameter Outlet
  • 2004 GMC Sierra 2500 HD SLE 8 Cyl 6.0L 133.0 in. Wheelbase, With 3 in. Diameter Outlet
  • 2004 GMC Sierra 2500 HD WT 8 Cyl 6.0L 133.0 in. Wheelbase, With 3 in. Diameter Outlet
Product Details
Location : Passenger SideEmissions : Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)Notes : Gaskets Included; 79 in. overall lengthRestricted States : California|Colorado|New York|MaineType : Catalytic ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold individuallyGasket Included : With GasketOxygen Sensor Ports : Factory OEM PortsOxygen Sensor Port Location : Factory OEM LocationsWarranty : Magnaflow 25,000 Mile Limited WarrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Series : OEM Grade SeriesTube Material : Stainless Steel
No Returns Accepted - Catalytic Converter, CARB and Federal EPA Standards, 50-state Legal, Semi-Universal (Welding Required)
Magnaflow®
No Returns Accepted - Catalytic Converter, CARB and Federal EPA Standards, 50-state Legal, Semi-Universal (Welding Required)
Part Number: M66445009
Guaranteed to Fit
$554.00
Vehicle Fitment
  • 2004 GMC Sierra 2500 HD SLT 8 Cyl 6.0L EO# D-193-100; Eng Fam No: 4Gmxt06.0188; Cutting And Welding Required
  • 2004 GMC Sierra 2500 HD Base 8 Cyl 6.0L EO# D-193-100; Eng Fam No: 4Gmxt06.0188; Cutting And Welding Required
  • 2004 GMC Sierra 2500 HD SLE 8 Cyl 6.0L EO# D-193-100; Eng Fam No: 4Gmxt06.0188; Cutting And Welding Required
  • 2004 GMC Sierra 2500 HD WT 8 Cyl 6.0L EO# D-193-100; Eng Fam No: 4Gmxt06.0188; Cutting And Welding Required
Product Details
Emissions : CARB and Federal EPA Standards, 50-state LegalNotes : 3 in. Inlet/Outlet; 16 in. overall lengthType : Catalytic ConverterProduct Fit : Semi-Universal (Welding Required)Recommended Use : OE ReplacementQuantity Sold : Sold individuallyEO Number : D-193-100Gasket Included : Without GasketWarranty : Magnaflow 5 year / 50,000 Mile WarrantyReturns Policy : NON-RETURNABLEProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Series : California SeriesTube Material : Stainless Steel
HM Grade Series Catalytic Converter, 8, 6.6 Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)
Magnaflow®
HM Grade Series Catalytic Converter, 8, 6.6 Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)
Part Number: M6660501
Guaranteed to Fit
$771.00
Vehicle Fitment
  • 2004 GMC Sierra 2500 HD SLE 8 Cyl 6.6L
  • 2004 GMC Sierra 2500 HD Base 8 Cyl 6.6L
  • 2004 GMC Sierra 2500 HD WT 8 Cyl 6.6L
  • 2004 GMC Sierra 2500 HD SLT 8 Cyl 6.6L
Product Details
Emissions : Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)Notes : 45.75 in. overall lengthRestricted States : California|Colorado|New York|MaineType : Catalytic ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold individuallyGasket Included : Without GasketOxygen Sensor Ports : Factory OEM PortsOxygen Sensor Port Location : Factory OEM LocationsWarranty : Magnaflow 25,000 Mile Limited WarrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Series : HM Grade SeriesTube Material : Stainless Steel
Passenger Side HM Grade Series Catalytic Converter, Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)
Magnaflow®
Passenger Side HM Grade Series Catalytic Converter, Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)
Part Number: M6623781
Guaranteed to Fit
$1,176.00
Vehicle Fitment
  • 2004 GMC Sierra 2500 HD SLE 8 Cyl 8.1L With 2.5 in. Diameter Outlet
  • 2004 GMC Sierra 2500 HD WT 8 Cyl 8.1L With 2.5 in. Diameter Outlet
  • 2004 GMC Sierra 2500 HD Base 8 Cyl 6.0L 133.0 in. Wheelbase, With 2.5 in. Diameter Outlet
  • 2004 GMC Sierra 2500 HD SLE 8 Cyl 6.0L 133.0 in. Wheelbase, With 2.5 in. Diameter Outlet
  • 2004 GMC Sierra 2500 HD SLT 8 Cyl 8.1L With 2.5 in. Diameter Outlet
  • 2004 GMC Sierra 2500 HD WT 8 Cyl 6.0L 133.0 in. Wheelbase, With 2.5 in. Diameter Outlet
  • 2004 GMC Sierra 2500 HD Base 8 Cyl 8.1L With 2.5 in. Diameter Outlet
Product Details
Location : Passenger SideEmissions : Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)Notes : Gaskets Included; 25.5 in. overall lengthRestricted States : California|Colorado|New York|MaineType : Catalytic ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold individuallyGasket Included : With GasketOxygen Sensor Ports : Factory OEM PortsOxygen Sensor Port Location : Factory OEM LocationsWarranty : Magnaflow 25,000 Mile Limited WarrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Series : HM Grade SeriesTube Material : Stainless Steel
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Product Questions & Answers

Magnaflow Passenger Side HM Grade Series Catalytic Converter, Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)
$1176
Q:Does this fit 133 wheelbase, and looks like the 2.5” is a slip joint for the 3” muffler? Show Less
Bruce
A:BEST ANSWERHi Bruce, There is no fit note about the wheelbase on this part. it does have a 2.5 outlet. This catalytic converter thas Federal type emission (47 State). Just a heads up, some states now require the use of CARB-COMPLIANT AFTERMARKET CONVERTERS. Please check the vehicle emission label usually found underneath the hood of the car to make sure the catalytic converter matches the car's Emission label specifications. Then we go from there. Show less
Grace G.
 
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Magnaflow No Returns Accepted - Catalytic Converter, CARB and Federal EPA Standards, 50-state Legal, Semi-Universal (Welding Required)
$554
Q:On this catalytic converter # 445009 will fit on my 2001 gmc Denali on the driver side as smog station says that’s the side that was illegal and needed replaced ? Show Less
Michael L.
A:BEST ANSWERHi Michael, I'm glad to help you out. This is not a direct replacement for the 2001 Denali. This is a universal fit converter that will require cutting and welding for installation. This should also match the EFN (Engine Family Number) VGM5.0HPG1EK of the vehicle that is found under your hood on the Vehicle Emissions Control Information (VECI) label. We still advise installing direct-fit catalytic converters on vehicles for better fitment and results on emission. Here's a link on what we have available for the 2001 GMC Yukon Denali models: https://www.carparts.com/search?q=Catalytic_Converter&itemsperpage=15&refinements[productFit]=Direct_Fit&vehicle[cylinders]=8&vehicle[liter]=6%2E0&vehicle[submodel]=Denali&vehicle[model]=Yukon&vehicle[make]=GMC&vehicle[year]=2001 I hope this helps. Happy shopping. Show less
Arnel E.
 
1 Question, 1 AnswerView all Q&As >

Helpful Automotive Resources

P0430 Code: Catalyst System Efficiency Below Threshold (Bank 2)
P0430 Code: Catalyst System Efficiency Below Threshold (Bank 2)In most cases, a vehicle with an inefficient catalytic converter will continue to run just fine. But if the converter is obstructed internally, it can cause poor engine performance and may even damage the engine in the long run.
P0042 Code: HO2S Heater Control Circuit Bank 1 Sensor 3
P0042 Code: HO2S Heater Control Circuit Bank 1 Sensor 3Bank 1 is the side of the engine where the #1 cylinder is located. P0042 code is set when your car’s PCM determines a potential problem with the heater element circuit of the oxygen sensor.
Can You Drive Without a Catalytic Converter?
Can You Drive Without a Catalytic Converter?Technically, yes. Older cars ran just fine before catalytic converters became commonplace in the 1970s. So, if your question is whether your car will run without one, then it most certainly will. But the other question you should be asking is—should you risk it?  Removing or disabling the catalytic converter could
P0316 Code: Engine Misfire Detected on Startup (First 1000 Revolutions)
P0316 Code: Engine Misfire Detected on Startup (First 1000 Revolutions)The PCM may disable the misfiring cylinder or cylinders in order to prevent further damage to the engine. Code P0316 is often listed in addition to one or more of the P0300 series codes that are associated with the misfiring cylinder/s.
P0134: O2 Sensor Circuit No Activity Detected (Bank 1, Sensor 1)
P0134: O2 Sensor Circuit No Activity Detected (Bank 1, Sensor 1)The Bank 1 portion of the code refers to the side of the engine with the number one cylinder. Sensor 1 refers to the upstream O2 sensor.
How to Tell If the Catalytic Converter is Clogged
How to Tell If the Catalytic Converter is CloggedA clogged catalytic converter will present symptoms, while a chemically failed cat con that’s not clogged typically just illuminates the check engine light or malfunction indicator lamp (MIL). Also, if the cat con that just fails chemically but doesn’t clog is not the light-off cat con (the cat con closest