Gibson Performance Slip on Muffler for the Yamaha Rhino XR66F 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. USFS Approved Spark Arrestor. This Gibson Exhaust Kit is a direct fit replacement and includes all hardware for a hassle free bolt on installation on your 2004-2007 Yamaha XR66F Rhino 660. The part number is Gibson 96008.