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I have an E40 custom tune on my M235i. There is a substantial difference between the custom tune and the E30 OTS map because the OTS maps run conservative. With that being said, I maxed out on power with the E40 custom tune because the HPFP couldn't supply enough fuel. Only thing after FBO and E85 is fueling and turbo which starts getting expensive. If you're gonna wait a while before fuel/turbo upgrade I'd say get a custom E40 tune but maybe with a less expensive tuner?
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