FMF Racing Powercore 4 Muffler — Fits Yamaha YZ450F 2003-2005, WR450F 2003-2006

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SKU: FMF044222
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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.

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FMF Racing Powercore 4 Muffler for Yamaha YZ450F & WR450F

Boost the performance of your Yamaha YZ450F (2003-2005) and WR450F (2003-2006) with the FMF Racing Powercore 4 Muffler. This high-performance exhaust system is designed to significantly increase power output, making it an essential upgrade for riders looking to gain a competitive edge. Featuring an aircraft-quality extruded aluminum canister and durable stainless steel components, the Powercore 4 offers a perfect balance of lightweight construction and rugged reliability.

Key Features & Benefits:

  • Enhanced Power: Engineered to deliver maximum power gains throughout the entire RPM range, providing improved acceleration and throttle response.
  • Durable Construction: The extruded aluminum canister is built to withstand the harsh conditions of off-road riding, while stainless steel components ensure long-term durability and corrosion resistance.
  • Optimized Exhaust Flow: Designed to improve exhaust gas velocity and flow, contributing to increased engine efficiency and performance.
  • Direct Fitment: Precisely manufactured to fit your Yamaha YZ450F or WR450F models, ensuring a straightforward installation process.

The FMF Racing Powercore 4 Muffler is the ideal choice for riders who demand superior performance and unwavering quality. Its race-inspired design not only enhances your bike's capabilities but also provides a distinctive sound. Whether you're competing on the track or exploring challenging trails, this muffler will help you achieve your best performance. Trust FMF Racing for cutting-edge exhaust technology.

Upgrade your Yamaha with the FMF Racing Powercore 4 Muffler and feel the difference. Available now at GGCRACING for all your performance needs.

Vehicle Fitment

Years Make Model Trim
2003-2006 Yamaha WR450F Base
2003-2005 Yamaha YZ450F 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

FMF Racing Powercore 4 Muffler for Yamaha YZ450F & WR450F

Boost the performance of your Yamaha YZ450F (2003-2005) and WR450F (2003-2006) with the FMF Racing Powercore 4 Muffler. This high-performance exhaust system is designed to significantly increase power output, making it an essential upgrade for riders looking to gain a competitive edge. Featuring an aircraft-quality extruded aluminum canister and durable stainless steel components, the Powercore 4 offers a perfect balance of lightweight construction and rugged reliability.

Key Features & Benefits:

  • Enhanced Power: Engineered to deliver maximum power gains throughout the entire RPM range, providing improved acceleration and throttle response.
  • Durable Construction: The extruded aluminum canister is built to withstand the harsh conditions of off-road riding, while stainless steel components ensure long-term durability and corrosion resistance.
  • Optimized Exhaust Flow: Designed to improve exhaust gas velocity and flow, contributing to increased engine efficiency and performance.
  • Direct Fitment: Precisely manufactured to fit your Yamaha YZ450F or WR450F models, ensuring a straightforward installation process.

The FMF Racing Powercore 4 Muffler is the ideal choice for riders who demand superior performance and unwavering quality. Its race-inspired design not only enhances your bike's capabilities but also provides a distinctive sound. Whether you're competing on the track or exploring challenging trails, this muffler will help you achieve your best performance. Trust FMF Racing for cutting-edge exhaust technology.

Upgrade your Yamaha with the FMF Racing Powercore 4 Muffler and feel the difference. Available now at GGCRACING for all your performance needs.

Vehicle Fitment

Years Make Model Trim
2003-2006 Yamaha WR450F Base
2003-2005 Yamaha YZ450F 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

FMF Racing Powercore 4 Muffler for Yamaha YZ450F & WR450F

Boost the performance of your Yamaha YZ450F (2003-2005) and WR450F (2003-2006) with the FMF Racing Powercore 4 Muffler. This high-performance exhaust system is designed to significantly increase power output, making it an essential upgrade for riders looking to gain a competitive edge. Featuring an aircraft-quality extruded aluminum canister and durable stainless steel components, the Powercore 4 offers a perfect balance of lightweight construction and rugged reliability.

Key Features & Benefits:

  • Enhanced Power: Engineered to deliver maximum power gains throughout the entire RPM range, providing improved acceleration and throttle response.
  • Durable Construction: The extruded aluminum canister is built to withstand the harsh conditions of off-road riding, while stainless steel components ensure long-term durability and corrosion resistance.
  • Optimized Exhaust Flow: Designed to improve exhaust gas velocity and flow, contributing to increased engine efficiency and performance.
  • Direct Fitment: Precisely manufactured to fit your Yamaha YZ450F or WR450F models, ensuring a straightforward installation process.

The FMF Racing Powercore 4 Muffler is the ideal choice for riders who demand superior performance and unwavering quality. Its race-inspired design not only enhances your bike's capabilities but also provides a distinctive sound. Whether you're competing on the track or exploring challenging trails, this muffler will help you achieve your best performance. Trust FMF Racing for cutting-edge exhaust technology.

Upgrade your Yamaha with the FMF Racing Powercore 4 Muffler and feel the difference. Available now at GGCRACING for all your performance needs.

Vehicle Fitment

Years Make Model Trim
2003-2006 Yamaha WR450F Base
2003-2005 Yamaha YZ450F Base

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