11-16 KTM 250SX: FMF Turbinecore 2 Spark Arrestor Silencer - 2-Stroke The FMF Turbinecore 2 spark arrestor silencer is their best selling silencer for FMF because of their reputation of quality performance enhancing design. The FMF Turbinecore 2 silencer has earned the U.S. Forestry stamp of approval with the built-in spark arrestor in addition to the FMF exclusive "Turbinecore Dampening System." The Turbinecore 2 silencer is a straight-through design that is less restrictive than stock for great track and trail performance. Match the FMF Turbinecore 2 silencer with a FMF pipe to maximize the potential of your bike.The best-selling Turbinecore 2 uses the exclusive "Turbine Dampening System."This top-notch product has well-earned its U.S. Forest legal status.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.The Turbinecore 2 is the #1 spark