Banks Power 04-07 Dodge 5.9L 325Hp CCLB Monster Exhaust System - SS Single Exhaust w/ Chrome TipThe 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