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You might get a temporary bump beyond the 5-10 rwhp that comes from leaning out BMWs rich mixture by clearing adaptions that have been retarding timing from the stock 32 degrees, but it won’t last unless you begin using a higher octane, move to a colder region, replace old plugs with new or replace weak coils with new, and if the increase does last it is for the other changes and not the tune.
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