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You can make power with lean burn without detonation, egr and water meth, cold air intake, and more octane all hurt lean burn performance, when your on the lean burn flammability limit, you want the hottest most explosive mix you can get, or the mix will not burn or not burn fast enough to be usable. It is possible to go past mbt with lean burn and have a mix that burns so slowly that your timing has to be advanced to the point of knocking and not making any power, in that case you need to add a hotter air intake or less octain in your fuel, so that you can speed up the burn and retard the timing and still make the same or more power.
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