MOOSE RACING Piston Kit MP2058 XD-4/VX-Pro3/VX-Pro4 Helmet Liner — XL Sound : Exclusive GMS LINK

Sound : Exclusive GMS LINK ™ Noise Cancellation System compatible

as well as quicker throttle response times

Adjustable perimeter liner and cheek pads allow owners to custom fit to their exact size requirement

cylindrical 3-1/2" muffler body in addition to the megaphone style of the original PowerPro

Features equal length headers

MOOSE RACING Piston Kit MP2058 XD-4/VX-Pro3/VX-Pro4 Helmet Liner — XL Sound : Exclusive GMS LINKMoose Racing pistons feature X style forgings and fully boxed style (race pistons) forgings for ultimate strength, minimizing friction, durability, power, and weight reduction Pro Race Piston increases the durability by reducing the stresses in the pin bore area Pro Race Piston allows the pin to flex while removing stress from the area Full radius dome designs maximize quench while eliminating hot spots that promote detonation Internal bracing