Want more speed and hook up? This is the proven product to do the job! The special designed pump shoe creates a bigger opening, which reduces the cavitation and adds hook-up on the Wave Blaster. Add the intake stuffer to the pump shoe and you have a combo that gains 2.5 MPH! This product replaces the OEM pump shoe on all the year models Yamaha Wave Blaster. The intake stuffer and pump shoe combination comes as a single part.