Borla 40942 XR-1 Stainless Steel Sportsman Racing Oval Muffler Made of corrosion resistant aircraft quality stainless steel which decreases the fatigue incurred on these parts during high performance uses BORLA uses patented straight-through and multi-core technology to help increase horsepower and torque. Precision manufactured using aircraft-quality stainless steel, guaranteed to look like new for one million miles. Inlet Diameter: 2 1/2" Outlet Diameter: 2 1/2" Case Size: 16"x4 1/2" 7 7/8"