FMF Factory 4.1 RCT Muffler - Aluminum 041517

If you're serious about extracting maximum power from your engine while reducing unsprung weight, the FMF Factory 4.1 RCT Muffler delivers measurable gains across the entire RPM range. The advanced Resonance Chamber Technology™ design optimizes exhaust scavenging for genuine horsepower increases—not marketing claims. Combined with its compact, centralized mass positioning, this muffler transforms how your machine performs on track or trail.

Built entirely from aerospace-grade aluminum at FMF's Southern California facility, the Factory 4.1 RCT offers the durability and precision you'd expect from a manufacturer trusted by professional racers. The shorter overall length minimizes crash damage risk while the Rapid Tuning System lets you dial in your exact setup without fabrication work.

• Resonance Chamber Technology™ design
• Aerospace-grade aluminum construction
• Shorter, crash-resistant profile
• Factory Forward Engineering geometry
• Centralized mass positioning
• Measurable power gains throughout RPM range
• Significant weight reduction
• Rapid Tuning System (RTS)
• 100% made in Southern California
• MPN: 041517