Volume 2 Number 5 91 Mach I,87 Yamaha V-Max,84 El Tigre,91 Indy

compare this 270 kit to the 190 kit (posted here 1/7/14) and to a stock Viper

most powerful stock sled engine ever, powering the Sidewinder and Arctic Cat Thundercat!

compare bone stock to lower backpressure muffler, and tuned airbox with outside air intake