I called powerdyne today and I told them that I had a 95 z28 with the 4.5lb supercharger, agresive cam, headers, intake, ignition, and that it has been slightly bored but I don't know how much... The problem is that the car is only showing it to be boosting at a little over 1lb :-( They told me to change the pulley out to a 6lb and change the crank shaft pulley to a 7.0" He said this would give it a solid 6psi of boost... and would be safe on a 10:1 compression ratio... Does this sound like a safe way of doing it or should I just stick with the 4.5lb pulley and change to a 7.0" crank... "he said that if I did this and not the pulley to I would only gain 2 maybe 3 psi of boost.. Any info would be GREATLY appreciated.. thanks,