wow guys real great info from everyone here...definatly all great advice to keep in mind for running nitrous...my bottom end consists of forged pistons with .30 overbore(i think they are speed pro but im not sure), forged crank, and factory reconditioned rods...I am going to be running the 685 box from mallory regardless due to the two step and me running a stick, and that nitrous retard feature is a great part of it that i always thought would come in handy some day...i figured id have to run a high octane or race fuel in my car if i wanted nitrous (or any other power adder for that matter) since my cr is quite high...just trying to get an idea of what i would be looking at for nitrous and the info has helped...maybe one day ill strap on a 150 shot and play!