Cobra Scalloped Billet Tip Black 4 Inch Slip On Muffler for 2011 Yamaha XVS1300 Stryker Motorcycles 4-inch muffler body has proprietary technology to prevent bluing making this slip-on virtually blue proof. Includes a small heat-shield that mates the muffler to the stock head pipes. The billet tip is unlike any other available in the motorcycle exhaust market with its unique shape and cut. Vendor part #: 2270b