i am thinking of getting a centrifugal supercharger but i want to run it on my stock motor, would it hurt it with like 9psi or would it be smarter to run 6psi? also i have 4.30 gears. would the supercharger even help me that much with those gears? i have seen cars with superchargers that have 4.56 gears that run good. also i was looking at powerdyne ones an liked how they dont use an oil feed line, are these superchargers any good or would i be better off with a vortech? thanks