Wehrli Custom Fab WC Fab Billet Exhaust Manifolds, 2017-2025 L5P/L5D
Fits 2017-2025 6.6L Duramax V8 (L5P) · 6.6L Duramax V8 (L5P, updated)
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where to buy · 2 retailers tracked
Headers replace the cast exhaust manifolds with tuned tubes so each cylinder has a smoother path out. This one is the WCFab WC Fab Billet Exhaust Manifolds, 2017-2025 L5P/L5D, listed to fit the 2017-2025 Chevrolet Silverado 2500HD/3500HD with the 6.6L Duramax V8 (L5P) or 6.6L Duramax V8 (L5P, updated).
why this one — This is a long, hot, awkward job on a truck. Budget for a shop and for a tune afterward. DmaxStore lists it at $1570.43, and the fitment above is what the listing itself states, not a guess.
No horsepower or torque figure published by WCFab for this part on the DmaxStore listing, read 2026-09-04. Not estimated.
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No published gain figure for this part, and nothing here is a guarantee. Price is a list price and can lag the retailer; confirm at checkout. See how we check a price and our affiliate disclosure.