In this category you will find all the flap boxes we can have for your quad YAMAHA Blaster, Banshee, ... in 2 strokes. We offer you original type valves but also VFORCE, RC2 valves in single or double roof. The choice of valves is extremely important to have an engine that runs perfectly at low and high speed. It is necessary to pay attention to the thickness of the blades, the orientation, the diffusion,..