Images of the 2015 BMW M3 and M4 have leaked – courtesy of Autocar UK. The M3 and M4 are, essentially, the same vehicle, with the M3 being a coupe and the M4 being a sedan. Both will sport the new M engine – the S55 B30. This is a 3.0-liter twin-turbocharged in-line six-cylinder engine…
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