aFe Power 49-44059-B Large Bore 4" Stainless Steel Down-Pipe Back Exhaust System Constructed of 4" mandrel-bent stainless steel tubing for maximum flow A free-flowing 24" long muffler is used to absorb high pitch tones producing a powerful sound Includes a 6" Dia. black stainless steel clamp-on tip with a laser-cut stainless steel aFe Power plate Adjustable hanger to cover all models This is a "Race Only" product used solely for competition; Its use is limited to closed-course and open-course racing that is formally sanctioned by a recognized racing organization