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Avoid all tunings. No tuning is best for long term reliability. There are dozen of senior expert engineers at BMW M who know one subsystem of the engine, they can fully simulate and know what is safe. This can never be replaced by a tuner shop who hacks into a software code and then tweak the parameters on a dyno to get the best hp/tq while monitoring engine knock. There is a massively huge gap between BMW engineering and tuners.
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