DescriptionEconomically priced high quality slip-on exhaust system Quiet 98dbs track and trail legal USFS forestry approved screen type removable spark arrestor Tig welded stainless steel pipe construction6061 brushed aluminum muffler housing Slip fit mid-pipe design allows movement of sub frames and prevents breaking exhaust systems All Big Gun exhausts are for closed course use only and are not intended for use on the road. NOTE: Big Gun exhausts are NOT LEGAL for sale or use on pollution controlled vehicles in the state of California. Material: Aluminum This item fits the following applications:2012-2017 Honda CRF450X.