Internal mufflers keep the straight stack look without the noise! Efficient sound reduction system - quiet as stock mufflers. Meets federal and California sound levels. 6.2% fuel mileage increase, 3% horsepower gain. 45 inches long. Available for 5", 6", and 7" dual straight stacks. Sold individually. NOTE - ONLY FOR USE WITH DUAL EXHAUST.
This internal muffler allows a straight pipe look while keeping engine noise to a minimum on any type of big rig, semi truck, freightliner truck, international truck, kenworth truck, mack truck,peterbilt truck. volvo truck or any other commercial truck.