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The stock setup is quite good for street use and decent for track, but if you are looking for the best lap time you need an improvement and KW V3/PSS10 are far superior than stock suspension. Mperformance coilovers is nothing but a KW V3 with different rate springs (more street oriented). Everything can be improved, a KW Clubsport is even better but it depends on what you're looking for.
Nothing to say about BC coils because I never tried them, forget HAS on a M car.
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