Gibson Performance Slip on Muffler for the Yamaha Rhino 660 provides superb power and quiet operation. Gibson muffler features a louvered & chambered internal muffler core. No packing. Gibson has incorporated rubber mounting points and a compression spring fitting, allowing for extreme flexibility during the toughest terrain, finishing with a mirror bright polished T304 Stainless exhaust end cap This is a direct fit replacement and includes all hardware for a hassle free bolt on installation. Lowest sound level on the market. Meets sound requirements. USFS Approved Spark Arrestor.