KTM FMF Fatty Expansion Chamber

Durable steel expansion chamber for broader power and improved gas flow

The KTM FMF Fatty Expansion Chamber is a high-performance exhaust upgrade designed to enhance power delivery and throttle response on KTM two-stroke motorcycles. Constructed from extra-strong sheet steel and finished with a nickel-plated surface, this expansion chamber provides excellent durability and resistance to corrosion while maintaining a clean, factory-style appearance.

Details:
• Made from extra-strong sheet steel for long-lasting durability
• Nickel-plated finish for corrosion resistance and easy maintenance
• Improves gas flow and throttle response across the entire RPM range
• Provides a wide, even engine speed range for smoother power delivery
• Designed for direct fitment and easy installation
• Recommended for use with FMF or compatible silencers for optimized performance

Compatibility:
Fits select KTM two-stroke models. Please confirm your bike’s model and year for exact fitment before installation.

Built for both performance and longevity, the KTM FMF Fatty Expansion Chamber delivers smooth, consistent power and refined exhaust flow ideal for motocross and off-road use.