yeah, i was just thinkin, every one that buys a 400ex or any other sport quad always turns it into some kind of high performance, mx or duning quads. has anyone ever made a sport quad into a mud machine? like adding huge mud tires and every thing.cause that's what i would do. Also, Team alba racing sell warrior engines stroked to 400cc. They also say that that would beat a 400ex stock. does anyone have any proof?