According to sources BMW is not going to make a sedan version of the M3 when the next-generation arrives. Sources site unimpressive sales as the main reason that BMW is not going to produce another sedan version. When the previous M3 was out, US buyers demanded a sedan version of the M3, but sales have been disappointing.
If the sources are correct, the next-generation M3 will only be available as a coupe and convertible.
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