An aero-form reed valve that corrects the problems associated with existing reed valve designs Maintains flow velocity through the valve and redirects the intake charge for even distribution to the intake ports Provides quicker, sharper throttle response and more horsepower low, middle and especially on top 1-piece aluminum casting; no manifolds to trim or plastic pieces to insert Comes with Boyesen Pro Series Reeds Will accept Rad Reeds or Pro Series Reeds from Boyesen This product can be used with Honda 4 Trax 86-89 Honda ATC250R (Liquid Cooled) 85-86