FMF Q4 Slip-On Muffler 044195 for Yamaha WR250F (2003–2006) — Lightweight, Deep-Toned Performance Upgrade

The FMF Q4 Slip-On Muffler 044195 for Yamaha WR250F (2003–2006) delivers a race-proven exhaust upgrade that trims weight while boosting exhaust flow for improved throttle response. Constructed from aircraft-grade aluminum with high-strength stainless steel components, it resists heat and corrosion under demanding off-road use.

The Q4 uses intricate chambers, baffles and proprietary multistage packing to deliver a deep, aggressive tone while keeping noise within regulated limits. It carries a max sound output of 96 dB, with many FMF models running quieter than 93 dB for better compliance on a wide range of courses.

Designed for straightforward installation, this slip-on fits Yamaha’s header options—FMF or stock OEM—and includes a removable spark arrestor for trail use. Its lightweight design and optimized internal layout enhance exhaust flow, contributing to sharper throttle response and potential horsepower gains on the WR250F platform.

• Materials: aircraft-grade aluminum can with stainless steel hardware
• Fitment: Yamaha WR250F (03–06); Slip-On compatible with FMF or OEM header
• Sound: max 96 dB, with internal packing and chambers tuned for a deep, aggressive tone
• Included: removable spark arrestor for trail riding
• Performance: refined internal baffles and packing improve exhaust flow and throttle response

With a sleek, polished finish, the Q4 Slip-On integrates cleanly with the bike’s lines, delivering a performance-focused upgrade that’s readily noticeable on the trail.

FMF is the leader in high performance quiet technology and our Q4 is the next evolution in off road exhaust. The Q4 employs intricate chambers, baffles and proprietary multistage packing material making it the best performing quiet muffler available. With the Q4 you don’t need to hear the power, just feel the power!

-Developed over years of championship off-road racing

-Max Sound output 96dB; most models below 93dB

-Constructed from aircraft grade aluminum and high strength stainless steel

-Use with FMF or Stock OEM Header

-Removable spark arrestor included

The FMF Racing Q4 Muffler for Yamaha is engineered to optimize your motorcycle's performance and sound. Crafted with precision, this muffler features a lightweight design that reduces overall weight, enhancing handling and acceleration. The durable construction ensures longevity even under demanding riding conditions, making it an excellent upgrade for Yamaha enthusiasts seeking improved exhaust flow and a more aggressive sound.

The FMF Q4 Muffler utilizes advanced internal baffle technology to deliver a deep, commanding tone while maintaining compliance with noise regulations. Its high-quality materials resist corrosion and heat, ensuring reliable operation over time. Easy to install, this muffler seamlessly fits Yamaha models, providing a significant upgrade in both style and function. Whether you're looking to improve horsepower or enhance the aesthetic appeal of your bike, the FMF Racing Q4 Muffler is a top choice for serious riders.

Designed with precision engineering, this muffler offers optimal exhaust flow for increased power output. The sleek, polished finish complements the overall look of your motorcycle, adding a touch of performance-oriented style. The compact design allows for easy integration with existing exhaust systems, making it a practical and effective upgrade for Yamaha motorcycle owners seeking durability, performance, and a refined sound.

Features:

• Lightweight construction reduces overall bike weight for better handling

• Durable materials resist corrosion and heat for long-lasting performance

• Advanced internal baffle technology delivers deep, aggressive sound

• Easy to install and fits Yamaha models seamlessly

• Enhances exhaust flow to improve horsepower and throttle response