This is a great universal spark arrestor for 2-stroke machines! Using the proven design of the FMF Turbine Core Spark Arrestor, this version is made specifically for those machines that do not have a bolt on application. Using the exclusive "Turbine Dampening System" makes it a U.S. Forestry approved silencer. The Universal is also perfect for the older vintage machines in need of a legal spark arrestor. The straight-through design of the spark arrestor canister and the performance flow stainless steel end cap ensures strength, durability and most importantly, track and trail-proven unrestricted power. This spark arrestor comes with a kit of hardware including a mounting bracket, spacers, stinger tube, and a stainless steel mounting strap that paves the way for the garage mechanic to fit the unit onto their machine. The Turbinecore 2 is the #1 spark arrestor in the world. Available in 1-1/8" or 1-1/4" diameters.