Welcome to ZX2 Racing 4-2-1 Header.... There's a new ZX2 header on the market - a true 4-2-1 design that adds more top end power and midrange torque than current the other 4-1 bolt-on header offerings. Dyno results have shown a 10+ peak hp gain over a stock system, and improved torque over other long header designs. It is custom designed to fit a 1998-2002 ZX2... more info available at ZXtuner.