Lexx XC Spark Arrestor End Cap YAMAHA YZ250F YZ450F The Lexx XC is a USDA/Forest Service approved spark arrestor. The XC includes two interchangeable end pipes to give you the ability to tune for power and sound: 46mm race tip and quieter 32mm tip. The cone-type spark arrestor is easy to access for cleaning or removal. The Lexx XC replaces the end cap on stock silencer. The spark arrestor end cap features rugged and lightweight carbon fiber, aluminum, and stainless steel construction. All required hardware is included. It requires rivet gun for installation. The Lexx XC Spark Arrestor End Cap includes a limited lifetime warranty.