DYNOJET Jet Kit - Stage 1/2 - Yamaha Q421 2013 ATR-1 Helmet - Stealth -

ATR-1 Helmet - Stealth - Cyan - Medium

USFS Approved spark arrester included

Type: Replacement

Versatile all-day performance - allows riders to enjoy optimized performance in conditions and terrain that can often change over the course of a day

Open shape body that allows the rapid and direct flow of the exhaust gases

DYNOJET Jet Kit - Stage 1/2 - Yamaha Q421 2013 ATR-1 Helmet - Stealth -Jet Kit Stage 1 2 Yamaha Stage 1: stock engine filters, stock modified pipes; about a 5% power increase, Stage 2: stock mild modified engine, stock modified pipes, stock modified filters; about an 8% power increase, Increases power and drivability, Fully adjustable