Up for sale is FMF 2001-2003 XR100R Honda S/A PCIV SYSTEM CRF/XR 80/100 '01-11. The vendor part number is 41015. Please read the title to know what is for sale The latest version of the Powercore 4 design incorporates a hi-flow core which has more surface area to absorb more sound while flowing more exhaust Constructed with an extruded aluminum canister, a stainless steel midpipe that is MIG/TIG welded and has space age internal packing Lighter, stronger and more powerful than stock exhausts Powercore 4 S/A has a U.S. Forestry approved maintenance free, stainless steel spark arrestor screen