I have sprayed 200hp on bone stock motors w/ mech. fuel pumps. Just don't get greedy and READ THE PLUGS. Every engine is different you have to find what it likes. (timing, fuel press., plug heat range & etc.) I like to run seperate regulators for my N2O systems since Nos brand tune ups are based on 5.5 lbs of fuel pressure and NX are 10 lbs tune ups. Your carb won't like either. If you have any questions feel free to PM me.