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I've never really heard of 12.5 being safe for Forced Induction applications, when I supercharged my S-10 I was told to make sure it's never above 12.0 or you risk running too lean. With your high compression motors I have to say I don't recommend you have your car adjusted to above 12.0 either. In fact most turbo/supercharger applications have a A/F ratio around 11.6-11.8. It's not perfectly ideal, but it's not really rich either. So if you can adjust your car to around that, I would consider that a safe tune.
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