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Didn't Dustin tell you how much? I would guess 9-10 lbs but really don't remember the numbers on that pulley with the stock lower. If you go to an 80mm you'd be about 3-4 lbs more boost but would need a new tune and maybe a belt. It seemed like Mikes Z06 was about 14 lbs with the 80mm if I remember correctly. I could be wrong but that's close. My 80mm on my SS was about 13-14 also and I have the stock lower cause my current 75 is about 16 psi.
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