Ford 6.0L Style Exhaust Manifolds Required,Replaces Factory Exhaust Feed Systems Which Is Prone To Leakage,High Silicone Ductile Iron Y-Adapter,Less Restrictive Internally Shielded Expansion Bellows,Surface Rust Not Covered Under Warranty,12 Months or 24000 Mile Warranty,Crush Donuts Replaced w/Stainless Steel Gaskets,Reduces The Chance For Piping Burn Out,Maximizes Transfer of Heat Energy to the Turbo