Compact in size and lightweight, the Turbinecore spark arrestor system uses the exclusive "Turbine Dampening System" making it a U.S. Forest-approved silencer. Now older machines can be U.S. Forest legal with an updated factory look and sound. Re-packing is made easy as there are no rivets to drill out. Maximum performance, minimum noise. Constructed of an extruded aluminum canister with nickel-plated stinger and concave end cap. Fits stock pipes as well as aftermarket pipes (unless noted). Note: For closed course competition use ONLY. Not intended for street use. Detailed Specifications: Spark arrestor: Internal. Weight: 2.7 pounds.