for the e46 you can comfortably fit 4 wheels with mounted tires in the folded down rear seats... i'd assume it's the same with the e9x m3's. it shouldnt be a problem... just grab some old blankets or tire totes and you're set!
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2018 Grigio Telesto F80 M3 DCT | :: Bone Stock ::
2004 Titanium Silver E46 M3 6 Speed | :: Track Car ::
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