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I'm running a 9.1 lower and 3.25 upper hitting about 18-19PSI of boost on a Whipple. I'm running Meth and E85 as well. I've learned with swapping pulleys to get boost numbers up or down it's kind of an art versus an exact science. Two cars can have the same pulleys, but vary on boost levels.
Last edited by mauldin44; 04-14-2019 at 11:27 PM.
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