FMF 041592 Mini Factory 4.1 RCT Aluminum Slip-On Muffler

The FMF Racing Mini Factory 4.1 slip-on muffler combines race-proven performance with durable aluminum construction. Featuring FMF's Resonance Chamber Technology (RCT) both internally and externally, this muffler delivers massive power gains throughout the RPM range while reducing weight and centralizing mass for improved handling.

Key Features:

• Aluminum construction with natural finish and stainless steel end cap
• Patented core shape lowers sound levels while maintaining maximum power output
• Redesigned canister increases internal volume for superior sound absorption
• Factory Forward Engineering positions muffler closer to motor for centralized mass
• Shorter overall length reduces susceptibility to crash damage
• RTS (Rapid Tuning System) for quick and easy trackside adjustments
• Wrapped perforated core with proprietary packing material blend
• Includes removable spark arrestor screen insert
• Includes 94dB quiet insert for sound compliance
• Hand-built with aerospace-grade materials in Southern California
• Compatible with FMF or stock OEM headers

This slip-on muffler offers significant weight savings over stock while delivering improved throttle response and enhanced power delivery. The oval canister shape and stainless steel midpipe provide durability for demanding off-road conditions. Designed specifically for mini motocross applications with optimized core specifications for each fitment.

Note: Intended for closed course use only.