M cars don't have spares because it saves weight. They come with a tire patch kit with an air compressor. You could put a spare in the trunk with a small jack I guess, but if you have the AWD G80, you have to match the rolling diameter or risk damaging the AWD system. I don't know how the rear LSD will react to a small spare on the RWD M3/4.
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2022 G82///M4 Competition X-Drive - KW-HAS, EBC Bluestuff, Millway Race Camber Plates, Cup2 Connect*, PSI High Flow Midpipe, Lightweight Front Lip, M Perf Flow Through Wing
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