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17-24 GM L5P 6.6L Duramax WCFAB 3.5" Down Pipe

Replace the restrictive crushed factory downpipe on your 2017-2024 L5P Duramax with this 3.5" Down Pipe for improved exhaust flow.  Black Ceramic Coated and Heat wrapped.  Down Pipe includes bungs for sensors and NO tuning required to use this downpipe. 

***Connects to the DOC (Diesel Oxidation Catalyst) outlet flange and mates with OEM exhaust system front pipe with the 4 bolt style flange connection.***

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


Emissions Compliant - this product is an Emissions Intact Performance Part and DOES NOT tamper with or delete vehicle emissions equipment.

- 3.5" Down Pipe

- High Temp Black Ceramic Coat Finish

- Heat Wrap Pre-installed

- Catalyst Back - Emissions Compliant


- Made in USA

WCFAB: WCF100129

Lame California Prop 65 Notice