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Replace the restrictive factory downpipe on 2017–2025 L5P Duramax trucks with this 3.5" Wehrli Custom Fab downpipe to improve exhaust flow. It connects to the DOC outlet flange behind the turbo, mates to the OEM front pipe with a four-bolt flange, includes sensor bungs, comes pre-wrapped and black ceramic coated, and requires no tuning to use while remaining emissions compliant.
Wehrli 17-24 Chevrolet/GMC 6.6L L5P Duramax 3.5in Down Pipe
