The Big Gun Eco Series was designed with a few things in mind: performance, power, sound and craftsmanship. Big Gun Eco Series guarantee that the Eco Series delivers these things all without hurting your wallet. Made for most popular dirtbike models, the Eco Series is made from 0.049" stainless steel tubing and a 6061 brushed aluminum muffler canister. All Eco Series Exhausts are slip-on systems only. Economically priced high quality slip-on exhaust system. Quiet 98dB track and trail legal (with Vortex Quiet Insert, sold separately). U.S.F.S.-approved screen-type removable spark arrestor. TIG welded stainless steel pipe construction. 6061 brushed aluminum muffler housing. Black satin steel muffler tip. Slip-fit mid pipe design allows movement of subframes and prevents breaking exhaust systems. Stainless band strap mounts muffler to subframe. 3 - 6 horsepower increase on most models.