Wehrli 3.5-Inch Down Pipe — 2017-2023 Chevrolet/GMC 6.6L L5P Duramax
Unlock the full potential of your 2017-2023 Chevrolet or GMC 6.6L L5P Duramax with the Wehrli Custom Fabrication 3.5-Inch Down Pipe. The L5P Duramax is the most powerful factory Duramax ever built, but the OEM down pipe remains a restriction that limits turbo spool and exhaust efficiency. Wehrli's 3.5-inch down pipe — sized up from the standard 3-inch to match the L5P's larger turbocharger — delivers exceptional flow improvement, helping your L5P reach its true performance potential whether towing, pulling, or street driving.
Key Features
- 3.5-inch diameter — specifically sized for the L5P's larger turbocharger
- Fits 2017-2023 Chevrolet and GMC trucks with the 6.6L L5P Duramax
- Reduces exhaust back pressure for faster turbo spool and increased power
- Lowers EGTs under heavy towing and performance conditions
- Mandrel-bent for smooth, consistent flow throughout the down pipe
- Built by WCFab — one of the most trusted names in Duramax performance
- Compatible with stock and modified L5P turbocharger configurations
Built for the L5P Generation
The L5P Duramax represents the pinnacle of GM diesel engineering, and Wehrli's 3.5-inch down pipe is designed to keep pace with its capabilities. By freeing up exhaust restriction, this down pipe helps your L5P breathe better, make more power, and run more efficiently under the demanding conditions that Duramax owners regularly face.
Fitment: 2017-2023 Chevrolet/GMC 6.6L L5P Duramax
Part Number: WCF100129
Brand: Wehrli Custom Fabrication (WCFab)