twinscrews dont have any teflon seals either and they make crazy boost ;) plus they only need one carb and if run fuelinjected im pretty sure they can be low enough to keep everyting under a flat hood,only real downside is that they are pretty expensive and you have to custom fab everyting since there is no manifolds or pulleysetups anywhere to be found out of a catalog, oo wait i just changed my mind i like to custom fab everything since its so rare that anyting that is suposed to be bolt on fits and performs right,right out of the bow anyway ;)