PPE PPE 3" Stainless Steel Downpipe For 04.5-10 Chevy/GMC 6.6L LLY/LBZ/LMM Duramax
Fits 2004.5-2010 6.6L Duramax V8 (LLY) · 6.6L Duramax V8 (LBZ) · 6.6L Duramax V8 (LMM)
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A down pipe carries exhaust away from the turbo before it reaches the rest of the emissions equipment. This PPE pipe is a smooth 3-inch stainless steel replacement for the factory pipe, which is narrower and more restrictive, and it comes wrapped in a heat sleeve to help keep engine bay temperatures down.
why this one — This PPE down pipe carries a CARB Executive Order number, meaning it's certified legal even in California, which most aftermarket diesel exhaust parts are not. It covers three engine codes (LLY, LBZ, LMM) that all used the same factory down pipe design across 2004.5-2010 trucks, so one part fits all three.
No manufacturer or independent dyno figure found for this product (checked PPE's own listing and Rudy's Performance Parts). Down pipes in this category are marketed on flow and exhaust-gas-temperature improvements, not standalone hp/tq claims.
CARB EO# D-701-30 (50-state legal) per PPE's own product page - one of the few aftermarket diesel exhaust parts legal for sale in California. Sits upstream of the DPF/catalyst, no interaction with DPF/EGR/SCR hardware, so the DPF/EGR/DEF exclusion policy does not apply.
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.