Banks Power 03-04 Dodge 5.9L CCLB(Catted) Monster Exhaust System - SS Single Exhaust w/ Chrome TipThe 4 in. Monster exhaust system flows up to 122 percent better than stock and virtually eliminates backpressure. Banks streamlined 4 in. 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 factorys restrictive muffler with a polished stainless Monster muffler