I hear both way on this, A LOT. ledofthezep actually rides a -2 at the LIttle Sahara dunes quite freqequently, and last i heard he loved it. On the other hand some guys run a +4 for the dunes, and love it equally. Justintoxicated comes to mind, and i think SDD has one also. It really all depends on the state of tune your motor is in. Led has a mildly ported motor with pipes and a few other goodies, and he feels like the -2 runs pretty well out there. Justintoxicated has a +4mm stroker motor, so he runs the +4 arm for stability. SDD has a +7mm stroker, and thats the point where a stock arm gets to be a pain in the ass. Let us know how your motor is built up perf. wise and we can really give a more accurate, less general responce. Good Luck with yer buyin.