FMF 044497 Factory 4.1 RCT 4-Stroke Slip-On Muffler

The FMF Factory 4.1 RCT is a premium slip-on muffler engineered for serious 4-stroke off-road and motocross riders demanding maximum performance gains with race-proven durability. Built with FMF's Resonance Chamber Technology (RCT), this muffler is designed to broaden the powerband and deliver stronger mid-range and top-end power without sacrificing reliability.

The Factory 4.1 RCT features a lightweight titanium construction that dramatically reduces overall exhaust system weight compared to stock units, improving handling and rider fatigue over long motos. Its sleek, anodized end cap and precision-welded body reflect the same quality found on factory race machines.

Key Features:

• Resonance Chamber Technology (RCT) – optimizes exhaust flow and broadens the powerband for improved performance across the RPM range
• Lightweight titanium construction – significantly reduces weight over the OEM muffler
• Precision-welded body for superior strength and longevity
• Anodized end cap for heat resistance and a race-ready appearance
• Bolt-on slip-on installation – no header modifications required
• Designed for 4-stroke motocross and off-road applications
• Compliant with sound regulations for many closed-course off-road events

The FMF Factory 4.1 RCT muffler (MPN: 044497) is a top choice for riders looking to upgrade their exhaust system with a product trusted by professional and amateur racers alike. Compatible with FMF's full range of 4-stroke headers for complete exhaust system builds.