Material:Aluminum alloy. Comes with Resonator Delete Block. Smooth unrestricted flow designed, increasing airflow 80%. Improves throttle response, increase performance. Lower EGTS keeping your engine running at cooler temperatures. Full tig welded and precision CNC machining square aluminum flange, the pressure tested TIG weld guaranteed no leakage. Instead of restricted stock pipes, use larger diameter CNC mandrel to bend aluminum tubes to optimize airflow behind throttle and heater. The increased diameter of the air path and the large radius bend help to reduce the limit of the intake air, significantly increasing the performance and turboshaft Fit: 2011-2015 6.6L Chevy/GMC 2500/3500 LML Duramax Diesel.