2004.5-10 Chevy GMC LLY LBZ LMM Duramax HD 6.6L Upper 3" Turbo Diesel Down Pipe Heat Wrapped To Help With EfficiencyLowers Exhaust temp up to 65 Degrees Gain More Torque and Horsepower Increases Turbo Spool with potential Fuel Economy Gains Depending your tune 409 Stainless Steel Heat Treated Powder Coated