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This has been discussed ad nauseum for years now. Reference the correct subforum and you'll find what you are looking for.
To your second question, not with a piggyback. You will need to get an ECU flash tune (which at this point is still a bench tune) to remove the top speed limiter.
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2019 G30 M550i
GBNF:
2021 G80 M3, 2019 F90 M5 Competition, 2016 F80 M3, 2014 F22 M235i
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