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2017-2024 L5P Duramax 3.5" Down Pipe

- 3.5" Steel Down Pipe
- High Temp Black Ceramic Coat Finish
- Heat Wrap Pre-installed
- Catalyst Back - Emissions Compliant
- Made in USA
Availability: In Stock. Ships in 3-5 business days.
Shipping: This Product cannot ship to the state of California
Pricing: $319.00
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Replace the restrictive crushed factory downpipe / front pipe on your 2017-2024 L5P 6.6L Duramax equipped Chevrolet Silverado or GMC Sierra 2500 / 3500 HD truck with this 3.5" Down Pipe for improved exhaust flow.  Fabricated steel construction. Black High Temp Ceramic Coating with Heat wrap for thermal protection.  Includes bungs for sensors. NO tuning required. 

***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

WCFab piping kits and emissions-compliant tuning recommended for optimum performance gains.




Shipping Information

  • Item Requires Shipping
  • 11.0 lbs.
  • W10.0000” x H10.0000” x L30.0000”
  • This item ships in its own box.
  • This Product cannot ship to the state of California

Customer Reviews

Comment Total Reviews (1)

up pipes and down pipe.
  • Currently 5/5 Stars

Reviewed by:

Product ownership: Less than 1 month

Not purchased from: Wehrli Custom Fabrication - WCFab

I used this down pipe and replaced the up pipes with wc fab 2". I am not tuned and just have a derringer. My turbo seems to have less dead peddle. Truck seems to be more awake just overall after swapping out these parts. Pro tip: If you are going to go through the pain of swapping the down pipe it's only a bit more work to do the up pipes and totally worth it.

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