2017-2022 GM/CHEVROLET 6.6L DURAMAX L5P 3.5" TURBO DOWNPIPE - DOC PROVISION UPGRADE
Upgrade your 2017-2022 GM/Chevrolet 6.6L Duramax L5P with this high-quality 3.5" Turbo Downpipe featuring a DOC (Diesel Oxidation Catalyst) provision. Designed for improved exhaust flow and reduced backpressure, this precision-engineered downpipe enhances turbocharger efficiency and overall engine performance. The larger 3.5" diameter allows for better exhaust gas evacuation, which can lead to improved throttle response, quicker spool times, and more efficient power delivery.
Constructed from high-grade stainless steel for maximum durability and corrosion resistance, this downpipe is built to withstand extreme exhaust temperatures while maintaining long-term reliability. The integrated DOC provision ensures compatibility with factory emissions components, making this an ideal upgrade for performance enthusiasts who want gains without sacrificing compliance.
Features and Benefits:
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Fits 2017-2022 GM/Chevrolet 6.6L Duramax L5P engines
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3.5" mandrel-bent stainless steel construction for maximum flow and durability
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Includes DOC provision for emissions compatibility
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Improves turbo spool time and throttle response
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Reduces exhaust backpressure for better performance
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Precision TIG-welded joints for strength and longevity
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Direct bolt-on replacement with factory mounting points
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Designed to handle high EGT (exhaust gas temperature) conditions
Vehicle Compatibility:
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2017 Chevrolet Silverado 2500HD 6.6L Duramax L5P
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2017 Chevrolet Silverado 3500HD 6.6L Duramax L5P
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2017 GMC Sierra 2500HD 6.6L Duramax L5P
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2017 GMC Sierra 3500HD 6.6L Duramax L5P
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2018 Chevrolet Silverado 2500HD 6.6L Duramax L5P
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2018 Chevrolet Silverado 3500HD 6.6L Duramax L5P
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2018 GMC Sierra 2500HD 6.6L Duramax L5P
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2018 GMC Sierra 3500HD 6.6L Duramax L5P
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2019-2022 Chevrolet Silverado 2500HD 6.6L Duramax L5P
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2019-2022 Chevrolet Silverado 3500HD 6.6L Duramax L5P
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2019-2022 GMC Sierra 2500HD 6.6L Duramax L5P
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2019-2022 GMC Sierra 3500HD 6.6L Duramax L5P
This 3.5" Turbo Downpipe with DOC provision is the perfect performance upgrade for your 2017-2022 GM/Chevrolet Duramax L5P. Offering increased exhaust flow, reduced backpressure, and improved turbocharger efficiency, it’s built from premium stainless steel for maximum strength and longevity.
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✔️ Orders are processed within 1 business day (Monday–Friday).
✔️ Orders placed on weekends or holidays will be processed on the next business day.
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California Proposition 65 Warning:
⚠️ WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm.
For more information, visit www.P65Warnings.ca.gov
***Connects to the DOC (Diesel Oxidation Catalyst) outlet flange and mates with OEM exhaust system front pipe with the 4 bolt style flange connection.***
Replaces the following GM Part Numbers: 12671086
