I gota believe a 4dm will rev, faster than any 10mill DM or SC. .. dune racing to me is 30% motor 70% set up... I think the 4dm don't get much love because its close in price to a 10dm... so why not step up... I believe if a big builder ... RL, pps , titan, k&t ... put there effort into it... everyone would think twice before dismissing it... .