if you're gonna run a rally conversion on a belt driven car u better hope nuthin will break like belts. besides the mtx2 cost a lot more than a hpi rs4 nitro. I have sucessfully conerted my racer2 into arally so it should be possible. But on a mtx2 c'mon that will hurt to see it having rocks stuck in it. jus dont forget the underplate to protect the chassis. I jus used a big piece of lexan for that