FMF Racing Factory 4.1 RCT Aluminum Muffler — Fits 2021-2023 Honda CRF450R/RX

SKU: FMF041602
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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

Product Details

Product Description
Part Numbers
Sizing & Fit

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

Maximize Your Honda CRF450R/RX with FMF Factory 4.1 RCT

Elevate your 2021-2023 Honda CRF450R or CRF450RX with the FMF Factory 4.1 RCT Aluminum Muffler. This high-performance slip-on is designed to provide significant power gains throughout the entire RPM range. By incorporating FMF's signature Resonance Chamber Technology, this muffler provides a smooth, linear power delivery that helps you maintain traction and control on the track or the trail.

Key Features and Benefits

  • Advanced RCT Engineering: Uses internal resonance chambers to manage sound levels while boosting overall engine performance.
  • Durable Aluminum Construction: Offers a perfect balance of weight savings and long-lasting durability for intense riding.
  • Carbon Fiber End Cap: Adds a touch of factory-style aesthetics while further reducing weight at the rear of the bike.
  • Versatile Fitment: Specifically engineered to fit both the Honda CRF450R and CRF450RX models from 2021 to 2023.

The Factory 4.1 RCT is the go-to choice for riders who demand consistent, reliable power. Its robust aluminum construction ensures it can handle the high-heat environment of a modern 450cc engine, while the carbon fiber end cap provides a professional, race-ready look. Whether you are competing in motocross or off-road racing, this muffler will help you unlock the true potential of your Honda. Trust in the engineering excellence of FMF Racing and find your next upgrade at GGCRACING.

Vehicle Fitment

Years Make Model Trim
2021-2023 Honda CRF450R Base
2021-2023 Honda CRF450RX Base

Product Details

Product Description
Part Numbers
Sizing & Fit

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

Maximize Your Honda CRF450R/RX with FMF Factory 4.1 RCT

Elevate your 2021-2023 Honda CRF450R or CRF450RX with the FMF Factory 4.1 RCT Aluminum Muffler. This high-performance slip-on is designed to provide significant power gains throughout the entire RPM range. By incorporating FMF's signature Resonance Chamber Technology, this muffler provides a smooth, linear power delivery that helps you maintain traction and control on the track or the trail.

Key Features and Benefits

  • Advanced RCT Engineering: Uses internal resonance chambers to manage sound levels while boosting overall engine performance.
  • Durable Aluminum Construction: Offers a perfect balance of weight savings and long-lasting durability for intense riding.
  • Carbon Fiber End Cap: Adds a touch of factory-style aesthetics while further reducing weight at the rear of the bike.
  • Versatile Fitment: Specifically engineered to fit both the Honda CRF450R and CRF450RX models from 2021 to 2023.

The Factory 4.1 RCT is the go-to choice for riders who demand consistent, reliable power. Its robust aluminum construction ensures it can handle the high-heat environment of a modern 450cc engine, while the carbon fiber end cap provides a professional, race-ready look. Whether you are competing in motocross or off-road racing, this muffler will help you unlock the true potential of your Honda. Trust in the engineering excellence of FMF Racing and find your next upgrade at GGCRACING.

Vehicle Fitment

Years Make Model Trim
2021-2023 Honda CRF450R Base
2021-2023 Honda CRF450RX Base

Product Details

Product Description

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

Maximize Your Honda CRF450R/RX with FMF Factory 4.1 RCT

Elevate your 2021-2023 Honda CRF450R or CRF450RX with the FMF Factory 4.1 RCT Aluminum Muffler. This high-performance slip-on is designed to provide significant power gains throughout the entire RPM range. By incorporating FMF's signature Resonance Chamber Technology, this muffler provides a smooth, linear power delivery that helps you maintain traction and control on the track or the trail.

Key Features and Benefits

  • Advanced RCT Engineering: Uses internal resonance chambers to manage sound levels while boosting overall engine performance.
  • Durable Aluminum Construction: Offers a perfect balance of weight savings and long-lasting durability for intense riding.
  • Carbon Fiber End Cap: Adds a touch of factory-style aesthetics while further reducing weight at the rear of the bike.
  • Versatile Fitment: Specifically engineered to fit both the Honda CRF450R and CRF450RX models from 2021 to 2023.

The Factory 4.1 RCT is the go-to choice for riders who demand consistent, reliable power. Its robust aluminum construction ensures it can handle the high-heat environment of a modern 450cc engine, while the carbon fiber end cap provides a professional, race-ready look. Whether you are competing in motocross or off-road racing, this muffler will help you unlock the true potential of your Honda. Trust in the engineering excellence of FMF Racing and find your next upgrade at GGCRACING.

Vehicle Fitment

Years Make Model Trim
2021-2023 Honda CRF450R Base
2021-2023 Honda CRF450RX Base

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