Stainless, 4 inch constant - diameter pipes and straight - through muffler outflow stock. Virtually eliminates backpressure and lowers exhaust gas temps. Throaty sound. 5 inch polished tip. 100 stainless system extends engine longevity by maintaining the turbine outlet EGT safely within stock recommendation. The 3 inch Turbine Outlet Pipe, which replaces the smashed stock piece (see below), flows 728 CFM 1 PSI, beating stock by 26 and the nearest competitor by 12. The streamlined 4 inch exhaust pipe and tailpipe are formed of heavy - wall tubing with constant - diameter bends to slash backpressure. The polished - stainless straight - through Monster muffler has an exclusive expansion chamber to dissipate the annoying mid - range drone that affects most straight - through designs. The high - flow muffler utilizes spun ceramic, very - high - temperature packing and delivers a rich, throaty exhaust sound. And the 5 inch polished rolled - edge tip has an adjustable clamp for positioning on tailpipe. Get it in your choice of chrome - over stainless or high temp black (And to help keep it looking good, there's a 12 inch air gap to keep heat from tarnishing the finish.)