Boyesen's patented dual-stage design incorporates a specially shaped top reed and ported bottom reed. The top reed is lightweight and resilient for crisp throttle response at partial throttle or low RPMs. The stiffer, bottom reed is ported to provide maximum flow and horsepower at higher RPMs.
- The best high-performance modification available for the money.
- Made with Boyesen's exclusive Dura-Flex material.
- Each kit is packaged to do one complete cylinder.