As the 2021 M3 comes nearer to production, final validation prototypes are being spotted testing on the roads even in the US as we can see above.
Under the hood of the 2021 M3 should be the new S58 3.0L TwinTurbo straight 6.
Spy Video by: Allcarnews
Images from: Bimmerpost.com, Motorauthority.com, BMW Global
Engine Video from: BMW Global
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