This new video from Auto Express sees Owen Mildenhall roll up at Blyton Park circuit to see how BMW’s M135i and the Subaru WRX STI compare on track.
The M135i is packing a turbocharged 3.0-litre straight six, developing 235 kW (320 hp) and 450 Nm of torque, while its 320R-spec Japanese rival produces identical figures thanks to a turbocharged 2.5-litre flat-four Boxer unit.