6.7 Powerstroke Downpipe Back Exhaust 4” & 5”

*Race and off-road use only* 

Upgrade your Ford’s exhaust flow and unleash serious diesel performance with this 6.7 Powerstroke Downpipe-Back Exhaust System, engineered and manufactured by SPELAB and independently retailed through Secret Diesel Performance. Designed for builders, racers, and diesel enthusiasts, this exhaust replaces the restrictive factory downpipe-back section with a high-flow alternative that improves exhaust gas evacuation, reduces backpressure, and delivers the aggressive sound your truck deserves.  

• Race & Off-Road Intent: Built for competition and off-road use (race and off-road use only), this system provides a direct, high-flow path without the restrictions of OEM emission hardware.