The 4 inch Monster exhaust system flows up to 122 percent better than stock and virtually eliminates backpressure. The Banks - designed expansion chamber dissipates the annoying mid - range exhaust drone that accompanies most straight - through mufflers. Banks streamlined 4 inch turbine outlet pipe with provision to retain stock catalytic converter, intermediate pipe(s) and tailpipe are formed of stainless, heavy - wall tubing with constant - diameter bends to maximize airflow and lower exhaust gas temps. Banks replaces the factory's restrictive muffler with a polished - stainless Monster muffler featuring a straight - through 4 inch diameter path that flows up to 129 percent better than stock. The Banks - designed expansion chamber dissipates the annoying mid - range exhaust drone that accompanies most straight - through mufflers. Monster muffler utilizes spun ceramic, very - high - temperature packing and delivers an authoritative - but never intrusive - 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)