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My brother just picked up a 2002 Mustang GT with a vortec supercharger on it. I have a couple of questions. What size pulley does it come with stock? I couldnt find any numbers on it anywhere (I was guessing 5-8). How much boost do you think a stock bottom end motor can take before you have to...

I dont know much about mustangs as you can see i drive an LS1 but i have a question. My brother and me just put a set of PI heads and intake on his 96 GT and it feels like more power is there but not as much as we thought. He has an auto if that matters any. Does he need tuning for max power...