aFe Power (49-03065-P) ATLAS 4" Stainless Steel Dual Side Exit DPF-Back Exhaust System with 6" Polished Tips for Ford Diesel Trucks Produced +8 horsepower and +11 lbs. x feet of torque over the stock exhaust system, Constructed from 4" mandrel-bent aluminized steel tubing for maximum flow 100 percent hand MIG-welded, Includes dual side exit 6" polished stainless steel clamp-on tips with a black laser-cut stainless steel aFe Power plate Includes high quality band clamps and OE-style bayonet hangers, Utilizes all factory mounting locations to provide a quick, hassle-free installation A mitered merge collector is incorporated to eliminate dead space that can cause turbulence and hinder flow, Unique air vents were designed to allow cold air in lowering EGTs Manufactured and Assembled in the USA