guys honestly if your running 30% youll be better off, i had three RTR engines on 20% and now im on my second race engine on 30%. It runs cooler (yes i mean cooler) easier to tune, and they last just as long if not longer than my 20% engines. honestly ppl freak out about 30% but its not that much of a big deal, just use the 30% and enjoy the benifits.