4-stroke power valve system

A 4-stroke powervalve is a device fitted to 4 stroke engines that constantly adjusts the internal diameter of the exhaust system to perfectly suit engine revolutions.

This ensures superior low to mid-range performance (ca. 12-20% improvement), linear power output and reduced exhaust noise levels while the valve is in its reduced opening position.

* Yamaha EXUP (Exhaust Ultimate Power valve)
* Honda HTEV (Honda Titanium Exhaust Valve)
* Suzuki SET (Suzuki Exhaust Tuning)