aFe LARGE BORE HD exhaust systems are constructed from mandrel-bent stainless steel tubing for maximum flow. Smooth transition bends allow for low turbulence, increasing horsepower and torque, while decreasing EGT. The 2-piece design and bayonet style hangers provide stability and for an easy installation. Finishing off the exhaust is a black, stainless steel slash cut tip with intercooling vents designed to reduce exhaust gas temperatures at the tailpipe. A unique stainless steel laser-cut aFe Power logo plate is riveted on for an aggressive style. Large Bore-HD 5 IN 409 Stainless Steel DPF-Back Exhaust System w/Polished Tip Ford Diesel Trucks 17-24 V8-6.7L (td) Ford Diesel Trucks 17-24 V8-6.7L (td)