I have a 2008 yamaha nytro with mpi stage one supercharger. It has pullies and hartman clutching for both 200 hp on pump gas and 240 hp on 50/50 race fuel. it also has Timbersled mtn tamer rear suspension with 162 x 2.25 attack 20 track, better boards, rsi riser and handlebars, lefty throttle, oft steering post relocator, and aftermarket exhaust. it has been the most reliable and fun sled I've owned. it has 5500 miles, 1200 with the supercharger.