my cruising RPMs are what worries me. on my /6 im not too too worried, since there damn near bullet proof (not that i mean i want to beat it up or anything). its my 360 that i plan on putting into the car later. i want it to last as long as absolutly possible. and running an overdrive will help that. yes its expensive, but its does nothing but good, so i say save up and really do your research. if you positive you wanna shell out $3k, do it! if not, dont!