538X

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Boyesen's® patented dual-stage design incorporates a specially shaped top reed and a 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
Allows replacement of stock reed stop with a Rev-Plate which permits the reeds to open freely and function efficiently