MBRP Exhaust MBRP 3.5" Armor BLK Down Pipe (GM8436)
Fits 2017-2026 6.6L Duramax V8 (L5P)
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A direct-fit pipe that bolts on right after the turbo on a Duramax diesel truck, in place of the restrictive factory downpipe, so exhaust gets out of the engine easier.
why this one — MBRP's own direct listing for exactly this truck and engine, in stock, with a clear current price and the manufacturer's stated flow-increase figure rather than a reseller guess.
No manufacturer or independent dyno figure found. MBRP states this pipe shows "up to an 11 percent increase in flow" versus the stock downpipe and a 3 lb weight savings; no standalone HP/TQ number is published for this SKU.
Not sold in California (manufacturer sales restriction, per product page Notes field). California Prop 65 warning for nickel/chromium exposure.
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.