20 part numbers
Exhaust Downpipe
Vehicle specific stainless steel downpipes that replace the factory exhaust pipe between the turbo outlet and the catalytic converter or DPF
Full range
Every Exhaust Downpipe Part Number We Supply
Why It Exists
Problems This Category Solves
- Factory downpipes restrict exhaust flow and increase back pressure during sustained high-load driving
- Mild steel downpipes corrode at the flange within a few seasons on salted roads
- Poorly machined flanges leak at the turbo joint under boost, causing performance loss and noise
- Universal downpipes require cutting and welding, increasing installation time and reducing shop margins
- Inconsistent pipe sizing and flange alignment lead to misfit and rework during installation
Buyers
Who Buys This Category
- Performance parts distributors sourcing bolt-on Duramax and Cummins hard parts by the pallet
- Diesel truck workshops installing and warranting exhaust upgrades on 6.6L Duramax and 6.7L Cummins platforms
- Truck accessory wholesalers supplying North American light truck owners with vehicle-specific exhaust components
- Online auto parts sellers needing a photographed, fitment-verified part with a clean product listing
Advantages
What Makes These Parts Different
- 3.5 inch bore size opens the turbo outlet to reduce back pressure and exhaust gas temperature
- 201 stainless steel with mirror polish resists corrosion from road salt and thermal cycling
- CNC machined flange ensures flat sealing surface to prevent leaks under boost and load
- Chrome plated flanges provide added protection at the bolted joint where coating failure is common
- Bolt-on design with pre-fitted flange eliminates need for welding or custom fabrication
- Vehicle-specific fitment eliminates guesswork and reduces installation time and rework
Applications
Where These Parts Are Used
- Diesel truck shops upgrading 2017-2023 Silverado and Sierra 2500/3500HD trucks that run hot under tow
- Distributors stocking 6.6L Duramax and 6.7L Cummins downpipes for 2013-2018 and 2014-2017 model years
- Fleet workshops replacing corroded factory downpipes on high-mileage 6.6L Duramax trucks
- Online sellers requiring a vehicle-specific exhaust part with a clean fitment list and high-quality image
Knowledge
Related Guides
201 Vs T-304 Stainless For Exhaust Parts
What the two stainless grades used across this catalogue mean for corrosion, cost and where each one belongs.
How To Choose Downpipe Diameter For A Diesel Truck
Why 3, 4 and 5 inch downpipes exist and how to match the size to the truck and the rest of the exhaust.
Sourcing Exhaust Parts Direct Instead Of Through A Trader
What changes when you buy exhaust hardware direct, and the questions worth asking any supplier.
Answers
Exhaust Downpipe Questions Buyers Ask
Will this fit a 2019 Silverado 3500HD Cab and Chassis?
No. The part covers 2017-2023 2500 and 3500HD pickup trucks with the 6.6L Duramax and is not designed for Cab and Chassis trucks.
What size is the pipe?
3.5 inch. It replaces the factory downpipe from the turbo outlet.
Is the flange included or do I need to weld one on?
The CNC machined flange is already fitted. The pipe ships as one piece and bolts on.
What material is used and why does it matter?
201 stainless steel with a mirror polish. It resists the salt and heat cycling that rusts mild steel pipes at the flange.
What is included in the package?
One downpipe. Gaskets and hardware are not listed with this part number, so plan on a fresh turbo outlet gasket.
Quote Exhaust Downpipe By Part Number
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