If BMW had built a Touring (wagon) version of the M3 it may have looked something like this rendered artist's impression.
BMW currently has no plans of building an M3 wagon or Touring as the brand calls it. But that didn't stop an artist from creating an impression of one. Some of the features of this M3 Touring rendering include a paint job called Pepper White with Satin, an Argray Titanium exhaust, an AC Schnitzer front lip and roof wing and Black Series BBS RE Magnesium wheels with a Brembo 8-piston caliper brake system. Wrapped around its wheels are Yokohama ADVAN Sport Tyres.
Figuratively speaking, under the hood lies an engine force-fed by a custom Vortech supercharger. The standard M3 has a 4.0-litre V8 engine that produces 309 kW (420hp) and peak torque of 400Nm (295 lb-ft) at 3900rpm. Its maximum engine speed is 8400rpm. Although no power figures were speculated, it's safe to say that this rendered M3 Touring's engine, if real, would improve performance nicely.
The M3's main rivals are the Mercedes-Benz C63 AMG and the discontinued Audi RS4, both of which have/had wagon/estate versions in real life.