NCY High Performance Stage 1 Power Pack (Horizontal) for 50cc 2-Stroke Yamaha ScootersCOMPATIBILITY: Aprilia – Amico 50 2T, SR Mod. 1993 50 2TMBK – Booster 50 2T, Stunt 50 2TYamaha – Zuma 50 2TReady to make your Yamaha Zuma 50 a screamer? This is the Stage 1 performance kit that will take your Zuma performance up a serious notch. Save $$ by purchasing this kit.This exhaust has a race-tuned expansion chamber to help your engine make maximum power in the range of 7000-12000 RPM. The included variator parts are necessary modifications to help your engine rev that high and take advantage of the power available to it. Your stock variator setup doesn’t want your engine screaming like that, so you’ve got to switch it up to make higher revs.Remember that performance parts do not come with any warranty, and will void your factory warranty. Follow good break-in procedures, and work with an experienced tuner for best results.**NOTE: Not legal for use in California on pollution controlled vehicles