Ive been running at 4.5 for a while now and is definitely noticeable from 3.5 over stock.
From when I first installed the JB3 I have tried 1.0, 2.0, 2.5, 3.5, 4.5, 5.0 and 5.5 over stock setting.
Without meth and 91 octane I've successfully run up to 4.5. With meth I ran 5.5 over stock with no issues.
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