FMF 040073 Powerbomb Header for Yamaha YZ/WR250F

The FMF Racing Powerbomb Header is an innovative exhaust header designed specifically for Yamaha YZ250F and WR250F motorcycles. This header utilizes FMF's patented technology to create a pre-muffler chamber that optimizes exhaust flow, resulting in measurable performance gains throughout the powerband.

Key Features:

• Increases horsepower by as much as 10% over stock headers
• Patented Powerbomb technology (U.S. Patent #7510050) creates a scavenging effect
• Reduces sound output by up to 1.5 dB compared to standard headers
• Compatible with any FMF muffler for complete exhaust system integration
• Premium stainless steel construction for maximum durability and corrosion resistance
• Direct bolt-on replacement for easy installation

The Powerbomb Header works by creating a pre-chamber that allows the exhaust gases to expand and cool slightly before entering the main exhaust system. This improves the scavenging effect, pulling spent gases out of the combustion chamber more efficiently and allowing for better cylinder filling on the intake stroke. The result is improved throttle response, broader powerband, and noticeable gains in both low-end torque and top-end horsepower.