{
    "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
}
2018 GMC Sierra 2500 HD
1
0
Price Match Guarantee
60-Day Returns
Lifetime Replacement
Price Match Guarantee
60-Day Returns
Lifetime Replacement
2018 GMC Sierra 2500 HD

2018 GMC Sierra 2500 HD Exhaust Manifolds

Refine by:

Shop Catalog

Showing 1 - 8 of 8 results
Sort by:
Exhaust Manifold, 8 Cyl., 6.0L Engine, without Ceramic Coating
Dorman®
Exhaust Manifold, 8 Cyl., 6.0L Engine, without Ceramic Coating
Part Number: RB674522
Guaranteed to Fit
$111.99
Vehicle Fitment
  • 2018 GMC Sierra 2500 HD Base 8 Cyl 6.0L Without Ceramic Coating
  • 2018 GMC Sierra 2500 HD SLE 8 Cyl 6.0L Without Ceramic Coating
  • 2018 GMC Sierra 2500 HD Denali 8 Cyl 6.0L Without Ceramic Coating
  • 2018 GMC Sierra 2500 HD SLT 8 Cyl 6.0L Without Ceramic Coating
Product Details
Location : Driver SideNotes : Cast iron materialIncludes : Three studs, three nuts, and one manifold gasketEmissions : 50-State LegalQuantity Sold : KitWarranty : Lifetime Dorman limited warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemicals including Nickel, 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 Solutions SeriesInterchange Part Number : REPC960702, 101261, 663017, 12556078, 12562235, 12562330, 12564155, 12571678, 12602037, 12610962, 12616285, 12686303Replaces OE Number : 101261, 663017, 12556078, 12562235, 12562330, 12564155, 12571678, 12602037, 12610962, 12616285, 12686303
Exhaust Manifold, 8 Cyl., 6.0L Engine
AC Delco®
Exhaust Manifold, 8 Cyl., 6.0L Engine
Part Number: AC12686302
Guaranteed to Fit
$673.99
Vehicle Fitment
  • 2018 GMC Sierra 2500 HD SLE 8 Cyl 6.0L 4-Door, Extended Cab Pickup, 6-Speed, Automatic Transmission, transmissionmfrcode : 6L90
  • 2018 GMC Sierra 2500 HD Denali 8 Cyl 6.0L 4-Door, Crew Cab Pickup, 6-Speed, Automatic Transmission, transmissionmfrcode : 6L90
  • 2018 GMC Sierra 2500 HD SLT 8 Cyl 6.0L 4-Door, Crew Cab Pickup, 6-Speed, Automatic Transmission, transmissionmfrcode : 6L90
  • 2018 GMC Sierra 2500 HD Base 8 Cyl 6.0L 2-Door, Standard Cab Pickup, 6-Speed, Automatic Transmission, transmissionmfrcode : 6L90
Product Details
Location : Passenger SideEmissions : 46-State Legal (Cannot ship to CA, CO, NY or ME)Quantity Sold : Sold individuallyWarranty : 24-months or unlimited mile AC Delco 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 : GM Original Equipment Series
Exhaust Manifold, 8 Cyl., 6.0L Engine, 6-Speed, Automatic Transmission, Transmissionmfrcode : 6L90
AC Delco®
Exhaust Manifold, 8 Cyl., 6.0L Engine, 6-Speed, Automatic Transmission, Transmissionmfrcode : 6L90
Part Number: AC12686303
Guaranteed to Fit
$558.49
Vehicle Fitment
  • 2018 GMC Sierra 2500 HD SLE 8 Cyl 6.0L 6-Speed, Automatic Transmission, transmissionmfrcode : 6L90
  • 2018 GMC Sierra 2500 HD Denali 8 Cyl 6.0L 6-Speed, Automatic Transmission, transmissionmfrcode : 6L90
  • 2018 GMC Sierra 2500 HD SLT 8 Cyl 6.0L 6-Speed, Automatic Transmission, transmissionmfrcode : 6L90
  • 2018 GMC Sierra 2500 HD Base 8 Cyl 6.0L 6-Speed, Automatic Transmission, transmissionmfrcode : 6L90
Product Details
Location : Driver SideEmissions : 46-State Legal (Cannot ship to CA, CO, NY or ME)Quantity Sold : Sold individuallyWarranty : 24-months or unlimited mile AC Delco 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 : GM Original Equipment Series
Exhaust Manifold, 8 Cyl., 6.0L Engine, without Ceramic Coating
Dorman®
Exhaust Manifold, 8 Cyl., 6.0L Engine, without Ceramic Coating
Part Number: RB674732
Guaranteed to Fit
$169.99
Vehicle Fitment
  • 2018 GMC Sierra 2500 HD Base 8 Cyl 6.0L Without Ceramic Coating
  • 2018 GMC Sierra 2500 HD SLE 8 Cyl 6.0L Without Ceramic Coating
  • 2018 GMC Sierra 2500 HD Denali 8 Cyl 6.0L Without Ceramic Coating
  • 2018 GMC Sierra 2500 HD SLT 8 Cyl 6.0L Without Ceramic Coating
Product Details
Location : Passenger SideNotes : Cast iron material; Round Inlet Port ShapeIncludes : 1 Manifold Gasket, 2 Flange Gaskets, 3 Studs, 3 NutsEmissions : 46-State Legal (Cannot ship to CA, CO, NY or ME)Quantity Sold : KitWarranty : Lifetime Dorman limited warrantyProp 65 Warning :

Warning SymbolWARNING: This product can expose you to chemicals including Nickel, 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 Solutions SeriesInterchange Part Number : C960707, 674525, 101371, 663227, 12569416, 12569530, 12578341, 12602038, 12612084, 12616286, 12647717, 12648339, 12677665, 12686302Replaces OE Number : 101371, 663227, 12569416, 12569530, 12578341, 12602038, 12612084, 12616286, 12647717, 12648339, 12677665, 12686302
Passenger Side OE Solutions Series Exhaust Manifold, 46-State Legal (Cannot ship to CA, CO, NY or ME)
Dorman®
Passenger Side OE Solutions Series Exhaust Manifold, 46-State Legal (Cannot ship to CA, CO, NY or ME)
Part Number: RB674732XD
Guaranteed to Fit
$202.49
Vehicle Fitment
  • 2018 GMC Sierra 2500 HD Base 8 Cyl 6.0L With Ceramic Coating
  • 2018 GMC Sierra 2500 HD SLE 8 Cyl 6.0L With Ceramic Coating
  • 2018 GMC Sierra 2500 HD Denali 8 Cyl 6.0L With Ceramic Coating
  • 2018 GMC Sierra 2500 HD SLT 8 Cyl 6.0L With Ceramic Coating
Product Details
Location : Passenger SideEmissions : 46-State Legal (Cannot ship to CA, CO, NY or ME)Quantity Sold : KitWarranty : Lifetime Dorman 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 : OE Solutions SeriesRecommended Use : OE ReplacementProduct Fit : Direct Fit
Ram's Horn Series Exhaust Manifold, 46-State Legal (Cannot ship to CA, CO, NY or ME)
Flowtech®
Ram's Horn Series Exhaust Manifold, 46-State Legal (Cannot ship to CA, CO, NY or ME)
Part Number: F31117041FLT
Universal Fit
$534.95
Product Details
Notes : Cast iron materialIncludes : One Manifold GasketEmissions : 46-State Legal (Cannot ship to CA, CO, NY or ME)Quantity Sold : Set of 2Warranty : 90-day Flowtech 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 : Ram's Horn SeriesRecommended Use : Performance ReplacementProduct Fit : Universal
Ram's Horn Series Exhaust Manifold, 46-State Legal (Cannot ship to CA, CO, NY or ME)
Flowtech®
Ram's Horn Series Exhaust Manifold, 46-State Legal (Cannot ship to CA, CO, NY or ME)
Part Number: F31117042FLT
Universal Fit
$499.95
Product Details
Notes : Cast iron materialIncludes : One Manifold GasketEmissions : 46-State Legal (Cannot ship to CA, CO, NY or ME)Quantity Sold : Set of 2Warranty : 90-day Flowtech 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 : Ram's Horn SeriesRecommended Use : Performance ReplacementProduct Fit : Universal
Ram's Horn Series Exhaust Manifold, 46-State Legal (Cannot ship to CA, CO, NY or ME)
Flowtech®
Ram's Horn Series Exhaust Manifold, 46-State Legal (Cannot ship to CA, CO, NY or ME)
Part Number: F3111704RFLT
Universal Fit
$363.95
Product Details
Notes : 1-5/8" primary diameter; 2-1/4" Collector; Cast Iron MaterialIncludes : One Manifold GasketEmissions : 46-State Legal (Cannot ship to CA, CO, NY or ME)Quantity Sold : Set of 2Warranty : 90-day Flowtech 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 : Ram's Horn SeriesRecommended Use : Performance ReplacementProduct Fit : Universal
Page 1 of 1 | Showing 1 - 8 of 8 results

Top Rated Products

AC Delco Exhaust Manifold, 8 Cyl., 6.0L Engine, 6-Speed, Automatic Transmission, Transmissionmfrcode : 6L90
$558.49( Review)
This item fit perfectly. On the expensive side but I believe you get what you pay forSee More
John P.
VERIFIED PURCHASER
Dorman Exhaust Manifold, 8 Cyl., 6.0L Engine, without Ceramic Coating
$111.99( Review)
I liked everything about This product! Came with everything i needed with and very eaSee More
Austin M.
VERIFIED PURCHASER

Popular Products

Product Questions & Answers

Flowtech Ram's Horn Series Exhaust Manifold, 46-State Legal (Cannot ship to CA, CO, NY or ME)
$534.95
Q:Fit a 2016 Ford Focus se?
Ayden T.
A:BEST ANSWERHi Ayden, I'm pleased to assist you. This is a universal kit not a direct fit for the 2016 Ford Focus SE. We do not have the compatible exhaust manifold compatible with the vehicle. You may want to consider purchasing heavy-duty cleaning industrial-strength wipes, good to have around your home and garage. Click on the link below to see and order while supplies last. You'll get a 30-day post-purchase price match guarantee with your order. I hope this helps. Enjoy shopping at Carparts.com! https://www.carparts.com/hand-cleaner/tub-o-towels/tubtw40?can=CPGG4850_20220524 Show less
Grace G.
 
3 Questions, 1 AnswerView all Q&As >
Flowtech Ram's Horn Series Exhaust Manifold, 46-State Legal (Cannot ship to CA, CO, NY or ME)
$363.95
Q:Will this fit an 08 impala 3.9l V6 doesn’t specify for v6 or v8?
James B.
A:BEST ANSWERHi James, I'm glad to assist you. No. These are not compatible. We currently don't carry direct-fit exhaust manifolds for the 2008 Impala 3.9L models. We suggest checking the local part stores around your area or the nearest GM dealership directly on what they have available to offer you. I hope this helps, and we thank you for inquiring. Show less
Arnel E.
 
5 Questions, 1 AnswerView all Q&As >
Flowtech Ram's Horn Series Exhaust Manifold, 46-State Legal (Cannot ship to CA, CO, NY or ME)
$499.95
Q:Will this work in my 2002 ford rangerXL  4cyl 2.3L?
Shep30
A:BEST ANSWERHi Shepard, Unfortunately, this will not be compatible with your 2002 Ranger. Show less
Arnel E.
 
5 Questions, 1 AnswerView all Q&As >

Helpful Automotive Resources

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.
P0058 Code: HO2S Heater Control Circuit High (Bank 2, Sensor 2)
P0058 Code: HO2S Heater Control Circuit High (Bank 2, Sensor 2)Many oxygen sensors also have a heating element that helps bring the sensor up to operating temperature quicker. These sensors need the heating element because they produce more accurate readings when brought up to a certain temperature. Once the sensors are up to operating temperature, they send exhaust oxygen data
P0080 Code: Exhaust Valve Control Solenoid Circuit High Bank 1
P0080 Code: Exhaust Valve Control Solenoid Circuit High Bank 1On vehicles equipped with variable valve timing (VVT), the PCM can adjust the camshaft position, altering the timing of the exhaust and/or intake valves. The PCM controls the camshaft position by regulating oil flow (via a solenoid) to the actuator(s) mounted on the end of the camshaft(s).
P0411 Code: Secondary Air Injection Incorrect Flow Detected
P0411 Code: Secondary Air Injection Incorrect Flow DetectedAs was mentioned, the secondary air injection system reduces emissions by introducing fresh air into the exhaust system. Older vehicles have a belt-driven air pump while newer models have an electric pump. Code P0411 may get registered when the amount of air entering the exhaust is not what the powertrain