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1) It's a straight swap if you have the new sport wheel, round airbag, and trim
2) M3 wheel uses the same round airbag as any E90 Sport wheel. Only the wheel and trim is different.
3) No such option exists in the E9X world. However the E89 Z4 M Sport heated steering whee is a straight plug and play option Quite rare though. This requires its own airbag and trim as well.
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'16 M3 | '23 718 Spyder
Past: E92 M3, F87 M2, E39 M5, etc |