Houser makes a maximum ground clearance A arm that help keep the quad low but allows for longer travel and help keep your a arms from taking a beating from the trails. The longer travel allows the quad to jump higher, fly farther, swim faster, leap tall buildings, etc... Having shocks revalving done is where you send either your stock shocks or an aftermarket pair adjusted to your riding style and weight. The Valves which control how and when the shock oil and air pressure is moved through the shocks and at what rate is what the revalving is doing. Also the interals are upraded to a higher quality (usually with stock shocks) or just refreshed if they are worn out(used aftermarkets). Basically the valving you need for ridding the dunes is different than that for mx, Also if you weigh 150 or 250 the valving and spring rates would be different.