The PowerCore®4 is designed to increase the horsepower and torque throughout the entire power curve and give you a noticeable power increase that is very usable and beneficial, no matter your riding style or ability. Features include space age internal packing for maximum packing life and a high-flow modular end cap. Internal core shape uses high-flow technology. Enhanced sonic evacuation provides for higher flow and increased power. Muffler includes removable spark arrestor. 97.5 dBA sound level. 95.5 dBA with QuietCore™ Spark Arrestor Insert, sold separately.
This accessory is restricted to closed-course competition use. See California Regulations regarding Emission-Related Parts and Accessories for products for closed-course competition use only.
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
The patented FMF Resonance Chamber Technology enhances and refines exhaust pressure. Its patented core shape lowers sound level while maintaining maximum power output, and the patented canister shape increases internal volume for more sound-absorbing material. Factory Forward Engineering centralizes mass and is less prone to impact damage.
High-flow, two-layer foam filter offers optimized filtration while maximizing airflow. Increases performance. Filter is completely washable and reusable. Service with Genuine Yamaha Foam Filter Oil.
YZ models are for closed-course competition use regardless of modification.
The GYTR® by FMF® MegaBomb™ Head Pipe can provide as much as a 3 hp boost, plus the MegaBomb™ actually reduces noises levels by as much as 1.5 dBA. Used by Yamaha Race Teams. The MegaBomb™ is designed to perform at the world’s highest levels of racing. It produces long header torque and short header over-rev.
Download 2018-2019 YZ450F Power Tuner Settings (Full Exhaust System + GYTR Air Filter)
Download 2019 YZ250F Power Tuner Settings (GYTR Performance Engine)
Download 2019 YZ250F Power Tuner Settings (Full Exhaust System)
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