Increase Your LLY's Performance When installed, our turbo mouthpiece will increase throttle response and help lower your engine's EGTs keeping your engine running at cooler temperatures. Doctor Diesel USA’s Turbo Inlet Manifold for your 2004.5-2005 GM 6.6L Duramax went through dramatic changes from the powder coated black body of the mouthpiece to the CNC machined edges giving your engine the look it deserves.
