FMF Powercore 4 Muffler Aluminum for Honda CRF250R 2006-2009 041274 FMF POWERCORE 4 CONSTRUCTED OF STAINLESS STEEL WITH A LIGHTWEIGHT ALLOY CAN SPACE AGE INTERNAL PACKING FOR MAXIMUM PACKING LIFE HI-FLO MODULAR END CAP INTERNAL SHAPE OF CORE USES HI-FLO TECHNOLOGY