Performance Sport 5" x 51.5" Muffler Heavy Duty Performance Sport Muffler Fits Various Makes And Models Length: 51.5" Inlet Tube: 5" Outlet Tube: 5" Overall Diameter: 10" Or 11" (Choose Above) Increases As Much As 50 HP 1/4 Mile Per Gallon Improvement 1 Year 100,00... See More