{
    "lazyNodes": false,
    "abFitnotesFlag": false,
    "abCrawlReviews": false,
    "productOptionsCookie": false,
    "orderDelayFlag": false,
    "skipSessionCookie": false,
    "covidMessage": false,
    "fullTitleCookie": false,
    "nrLoggerCookie": false,
    "checkoutReviewCookie": false,
    "productOptionSeqCookie": false,
    "maintenanceFlag": false,
    "bufferETACookie": false,
    "multiShippingDiscountFlag": false,
    "newFitmentFlag": false,
    "surveyOptInFlag": false,
    "crossSellFlag": false,
    "skuMappingFlag": false,
    "paySplitCookie": false,
    "callDisableFlag": false,
    "zipPaymentFlag": "u",
    "hassleFreeReturn": false,
    "lifetimeReplacement": false,
    "cpn_off": false
}
2021 GMC Sierra 1500
1
0
Price Match Guarantee
60-Day Returns
Lifetime Replacement
Price Match Guarantee
60-Day Returns
Lifetime Replacement
2021 GMC Sierra 1500

2021 GMC Sierra 1500 Catalytic Converters

Refine by:

Shop Catalog

Showing 1 - 15 of 31 results
Display item:
15
30
45
Sort by:
Front Catalytic Converter, 4, 2.7
Davico®
Front Catalytic Converter, 4, 2.7
Part Number: DAV19545
Guaranteed to Fit
$483.49
Vehicle Fitment
  • 2021 GMC Sierra 1500 Elevation 4 Cyl 2.7L Turbocharged
  • 2021 GMC Sierra 1500 SLE 4 Cyl 2.7L Turbocharged
  • 2021 GMC Sierra 1500 Base 4 Cyl 2.7L Turbocharged
Product Details
Location : FrontProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold individuallyWarranty : 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.

Center OE Replacement 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)
Catco®
Center OE Replacement 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: CAT9635
Guaranteed to Fit
$658.99
Vehicle Fitment
  • 2021 GMC Sierra 1500 Denali 8 Cyl 5.3L Federal and California Emissions
  • 2021 GMC Sierra 1500 Base 6 Cyl 4.3L Federal and California Emissions
  • 2021 GMC Sierra 1500 SLT 8 Cyl 5.3L Federal and California Emissions
  • 2021 GMC Sierra 1500 AT4 8 Cyl 5.3L Federal and California Emissions
  • 2021 GMC Sierra 1500 Base 8 Cyl 5.3L Federal and California Emissions
  • 2021 GMC Sierra 1500 SLE 8 Cyl 5.3L Federal and California Emissions
  • 2021 GMC Sierra 1500 Elevation 8 Cyl 5.3L Federal and California Emissions
Product Details
Location : CenterEmissions : Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)Notes : 36 in. overall lengthRestricted States : California|Colorado|New York|MaineType : Catalytic ConverterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold individuallyGasket Included : With GasketWarranty : 5-year or 50,000-mile Catco limited warranty on converter body with 50,000-mile 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 : OE Replacement SeriesTube Material : Stainless Steel
Center Catalytic Converter, Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)
AP Exhaust®
Center 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: APE645145
Guaranteed to Fit
$651.49
Vehicle Fitment
  • 2021 GMC Sierra 1500 Denali 8 Cyl 5.3L
  • 2021 GMC Sierra 1500 Base 6 Cyl 4.3L
  • 2021 GMC Sierra 1500 SLT 8 Cyl 5.3L
  • 2021 GMC Sierra 1500 AT4 8 Cyl 5.3L
  • 2021 GMC Sierra 1500 Base 8 Cyl 5.3L
  • 2021 GMC Sierra 1500 SLE 8 Cyl 5.3L
  • 2021 GMC Sierra 1500 Elevation 8 Cyl 5.3L
Product Details
Location : CenterEmissions : Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)Restricted States : California|Colorado|New York|MaineProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold individuallyWarranty : 5-year or 50,000-mile AP Exhaust limited warranty on converter body and 25,000-mile 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.

Center Catalytic Converter
Eastern®
Center Catalytic Converter
Part Number: EAST50601
Guaranteed to Fit
$663.99
Vehicle Fitment
  • 2021 GMC Sierra 1500 Denali 8 Cyl 5.3L
  • 2021 GMC Sierra 1500 Base 6 Cyl 4.3L
  • 2021 GMC Sierra 1500 SLT 8 Cyl 5.3L
  • 2021 GMC Sierra 1500 AT4 8 Cyl 5.3L
  • 2021 GMC Sierra 1500 Base 8 Cyl 5.3L
  • 2021 GMC Sierra 1500 SLE 8 Cyl 5.3L
  • 2021 GMC Sierra 1500 Elevation 8 Cyl 5.3L
Product Details
Location : CenterProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold individuallyWarranty : 5-year or 50,000-mile Eastern 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.

Catalytic Converter, 4, 2.7 Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)
AP Exhaust®
Catalytic Converter, 4, 2.7 Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)
Part Number: APE641646
Guaranteed to Fit
$477.49
Vehicle Fitment
  • 2021 GMC Sierra 1500 Elevation 4 Cyl 2.7L
  • 2021 GMC Sierra 1500 SLE 4 Cyl 2.7L
  • 2021 GMC Sierra 1500 Base 4 Cyl 2.7L
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)Product Fit : Direct FitRecommended Use : OE ReplacementWarranty : 5-year or 50,000-mile AP Exhaust limited warranty on converter body and 50,000-mile 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.

Catalytic Converter, 4, 2.7 Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)
Catco®
Catalytic Converter, 4, 2.7 Federal EPA Standard, 46-State Legal (Cannot ship to or be installed in vehicles originally purchased in CA, CO, NY or ME)
Part Number: CAT1550
Guaranteed to Fit
$488.49
Vehicle Fitment
  • 2021 GMC Sierra 1500 Elevation 4 Cyl 2.7L
  • 2021 GMC Sierra 1500 SLE 4 Cyl 2.7L
  • 2021 GMC Sierra 1500 Base 4 Cyl 2.7L
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)Restricted States : California|Colorado|New York|MaineProduct Fit : Direct FitRecommended Use : OE ReplacementQuantity Sold : Sold individuallyWarranty : 5-year or 50,000-mile Catco 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.

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), Universal
Davico®
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), Universal
Part Number: DAV633300
Universal Fit
$1,565.49
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)Restricted States : California|Colorado|New York|MaineType : Catalytic ConverterProduct Fit : UniversalRecommended Use : OE ReplacementQuantity Sold : Sold individuallyWarranty : 2-year or 25,000-mile Davico limited warranty on catalyst emission properties and 5-year or 50,000-mile limited warranty on tube, shell and weldsReturns 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.

No Returns Accepted -Catalytic Converter
Magnaflow®
No Returns Accepted -Catalytic Converter
Part Number: M6659959
Universal Fit
$161.00
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 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
No Returns Accepted -Catalytic Converter
Magnaflow®
No Returns Accepted -Catalytic Converter
Part Number: M6659956
Universal Fit
$161.00
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 : 2.5 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
No Returns Accepted -Catalytic Converter
Flowmaster®
No Returns Accepted -Catalytic Converter
Part Number: F132250220
Universal Fit
$77.49
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)Product Fit : UniversalRecommended Use : Performance ReplacementQuantity Sold : Sold individuallyOxygen Sensor Ports : Factory OEM PortsOxygen Sensor Port Location : Factory OEM LocationsWarranty : 5-Year Or 50,000-Mile Flowmaster Warranty On Exterior CasingsProp 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.

No Returns Accepted -Catalytic Converter
Catco®
No Returns Accepted -Catalytic Converter
Part Number: CAT602387
Universal Fit
$152.49
Product Details
Product Fit : UniversalRecommended Use : OE ReplacementProp 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.

No Returns Accepted -Catalytic Converter
Catco®
No Returns Accepted -Catalytic Converter
Part Number: CAT608387
Universal Fit
$158.99
Product Details
Product Fit : UniversalRecommended Use : OE ReplacementProp 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.

No Returns Accepted -Catalytic Converter
Catco®
No Returns Accepted -Catalytic Converter
Part Number: CAT608386
Universal Fit
$158.99
Product Details
Product Fit : UniversalRecommended Use : OE ReplacementProp 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.

No Returns Accepted -Catalytic Converter
Catco®
No Returns Accepted -Catalytic Converter
Part Number: CAT608395
Universal Fit
$159.99
Product Details
Product Fit : UniversalRecommended Use : OE ReplacementProp 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.

No Returns Accepted -Catalytic Converter
Catco®
No Returns Accepted -Catalytic Converter
Part Number: CAT608397
Universal Fit
$163.99
Product Details
Product Fit : UniversalRecommended Use : OE ReplacementProp 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.

Page 1 of 3 | Showing 1 - 15 of 31 results

Popular Products

Product Questions & Answers

Catco No Returns Accepted -Catalytic Converter
$163.99
Q:Is this the front and back converter for my car?
Shaun M.
A:BEST ANSWERHi Shaun, I am pleased to assist you. Apologies for the confusion. This is only for one catalytic converter, not two. The picture showed both sides, one with the oxygen sensor port and the other side. This is a universal converter meaning it is not vehicle-specific and would require welding. If you don't mind having it welded to the pipes, use the link below to directly place your order. Secure your order from limited stocks and take advantage of our ongoing sale. I hope this helps and enjoy shopping! https://www.carparts.com/catalytic-converter/catco/cat608397?can=CPGG4850_CSQA_20241010 Show less
Grace G.
 
3 Questions, 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