FMF Gnarly Pipe Expansion Chamber — Kawasaki KX500 1988–2004

This FMF expansion chamber is pipe-tuned for a broader, more tractable power delivery than the stock unit.

Fits: Kawasaki KX500 1988–2004.

Why riders pick it:

• Expansion chamber tuning sharpens throttle response and broadens the power spread
• Works with your stock silencer or any FMF 2-stroke silencer
• Classic FMF chamber design refined for consistent, predictable power delivery
• Direct bolt-on installation, no tuning required

⚠️ For closed-course competition / off-road use only — not legal for street use in some states. Confirm your local regulations.

Not sure it fits your bike? Send us your year and model and we'll confirm.