Pacific Performance Engineering (PPE) PPE 3.5" 304 Stainless Steel Down Pipe (117000800)
Fits 2017-2025 6.6L Duramax V8 (L5P)
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A 3.5-inch stainless steel pipe that replaces the factory downpipe right after the turbo on a Duramax diesel truck, opening up the exhaust path instead of fighting the restrictive stock piece.
why this one — PPE is a well-known diesel performance brand, and this Rudy's Performance Parts listing has a clear current price, several in stock, and fitment stated directly for both the Silverado and Sierra 2500/3500 with the L5P Duramax.
No manufacturer or independent dyno figure found. PPE markets this as lowering EGT and improving turbo efficiency/response versus the restrictive factory pipe; no standalone HP/TQ number is published for this SKU.
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.