I've ordered a valve body upgrade from LevelTen.com for a customer from Kuwait with a Toyota Prado that is fitted with a URD supercharger kit. I'm excited to lay my eyes on a URD kit for the first time. Not sure which version or stage he's got. The Prado is the International version of the 4Runner, shares underpinnings and drive train. It is slightly larger and wider than my Fortuner. The kit rendered his engine too powerful for the automatic transmission and damaged it, so he replaced the whole tranny. Now I'm getting him the valve body upgrade. Should be here sometime next week. Once it's here he will drive to my town in Saudi Arabia (about 250 miles south from Kuwait). I will keep this thread posted with how it goes, and pictures. I've done this upgrade on my Fortuner with beautiful results; here's a link to the kit I ordered: http://www.levelten.com/750E_F_VALVE_BODY_KIT_p/toy-ja210-5000sk.htm When I first installed the supercharger on my engine, my transmission second gear started slipping and taking a long time to shift. I installed this kit hoping that the transmission is not completely gone; although the second gear clutch was already worn, the upgrade kit eliminated the affects of the wear and I've been driving it like that for almost two years without any problems at all, with and without a supercharger. The gears hold so strong and shifts are so crisp. Only drawback is that the downshifts, unlike the up-shifts, are a bit slow. In the rare event, when I slow down suddenly and the transmission would still be in the middle of a down-shift as I accelerate again, it can cause an awkward punch. But that only happens really rarely. Probably happened only three or four times since I did the upgrade.