FMF Racing
FMF Racing Factory 4.1 RCT Stainless/Aluminum Muffler — Fits 2018-2021 Yamaha YZ450F YZ450FX
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FMF Racing Factory 4.1 RCT Stainless/Aluminum Muffler — Fits 2018-2021 Yamaha YZ450F YZ450FX
FMF Racing

FMF Racing Factory 4.1 RCT Stainless/Aluminum Muffler — Fits 2018-2021 Yamaha YZ450F YZ450FX

SKU: FMF044443

About FMF Racing FMF Racing engineers high-quality automotive parts and ...Read more

Price:
$649.99
6490 ENTRIES10X
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Car Wheel Size Chart

Wheel Diameter (inches) Tire Width (mm) Aspect Ratio Rim Width (inches)
14185655.5
15195606.0
16205556.5
17215507.0
18225457.5
19235408.0
20245358.5

Note: Wheel and tire sizes vary by car make and model. Always consult your vehicle’s manufacturer for exact specifications.

How to Read Tire Size

Example: 225/45R17 means:

  • 225 = Tire width in mm
  • 45 = Aspect ratio (height as % of width)
  • R17 = Rim diameter in inches

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About FMF Racing

FMF Racing engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full FMF Racing lineup with fast shipping and expert fitment support — order with confidence.

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Professional Grade Performance: FMF Factory 4.1 RCT

Experience the pinnacle of exhaust engineering with the FMF Factory 4.1 RCT Muffler. Designed for the serious racer, this system features Resonance Chamber Technology (RCT) to reduce sound while maintaining maximum power output. The stainless steel and aluminum construction offers an ideal balance of weight savings and extreme durability, ensuring your Yamaha YZ450F or YZ450FX performs at its peak in any condition.

Why Choose the Factory 4.1 RCT?

  • RCT Technology: Advanced internal chambers for improved power and sound control.
  • Carbon Fiber End Cap: Reduces weight while adding a factory-race aesthetic.
  • Premium Materials: High-grade stainless steel and aluminum for longevity.
  • Optimized Flow: Engineered for maximum exhaust scavenging.
  • Race-Proven: Used by top-tier factory teams worldwide.

The Factory 4.1 RCT is not just a muffler; it is a performance-enhancing tool that transforms your engine's response. The sleek design integrates perfectly with the lines of your Yamaha, providing a professional look and a deep, aggressive exhaust note. When you need consistent, high-level performance on the track, trust the quality of FMF Racing parts available at GGCRACING.

About FMF Racing

FMF Racing engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full FMF Racing lineup with fast shipping and expert fitment support — order with confidence.

Watch in action

Professional Grade Performance: FMF Factory 4.1 RCT

Experience the pinnacle of exhaust engineering with the FMF Factory 4.1 RCT Muffler. Designed for the serious racer, this system features Resonance Chamber Technology (RCT) to reduce sound while maintaining maximum power output. The stainless steel and aluminum construction offers an ideal balance of weight savings and extreme durability, ensuring your Yamaha YZ450F or YZ450FX performs at its peak in any condition.

Why Choose the Factory 4.1 RCT?

  • RCT Technology: Advanced internal chambers for improved power and sound control.
  • Carbon Fiber End Cap: Reduces weight while adding a factory-race aesthetic.
  • Premium Materials: High-grade stainless steel and aluminum for longevity.
  • Optimized Flow: Engineered for maximum exhaust scavenging.
  • Race-Proven: Used by top-tier factory teams worldwide.

The Factory 4.1 RCT is not just a muffler; it is a performance-enhancing tool that transforms your engine's response. The sleek design integrates perfectly with the lines of your Yamaha, providing a professional look and a deep, aggressive exhaust note. When you need consistent, high-level performance on the track, trust the quality of FMF Racing parts available at GGCRACING.

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