Material: T-409 Stainless steel. 5" Downpipeback DPF Delete pipe-No Muffler. Venturi-style design— eliminates the need for restrictive baffles. Lower your Exhaust Gas Temperatures, promoting a healthier engine. Optimized exhaust flow propels your truck's efficiency and performance. Enables your engine to breathe easier, further boosting its power output. Increase in fuel efficiency, resulting in savings at the pump. Only fit models equipped with 3-bolt flange and will not work for trucks equipped with the V-band clamp off the turbo direct pipe! Fits the 2015.5-2016 GMC Chevy Duramax 6.6L 2500/3500 pickup with the LML engine. Will not fit Cab & Chassis trucks.