I have an SN89 with 3.75" s/c pulley and a 6" crank pulley, I make bout 5-6 psi with HO impeller and fluid cooler. I normally don't rev my 93GT much above 5k so when I do the rpm calculation for the SN series I could reduce my pulley size to 3.50". Does anyone think the pulley change to 3.50" would give me any more boost or is it just a waste of money? I do have a Mr. Freeze meth kit that I haven't installed yet.
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