For the record, the M3 CS features Munich’s familiar 3,0-litre turbocharged inline-six, but with the wick turned up to 338 kW and 600 N.m. That’s enough, says BMW, for a zero to 100 km/h time of 3,9 seconds and a top speed of 280 km/h.
And Ingolstadt’s hot wagon? Well, the RS4 Avant employs a twin-turbo 2,9-litre V6 worth 331 kW and 600 N.m, which Audi says translates to a 0-100 km/h time of 4,1 seconds and a top speed of 250 km/h.
Thing is, the RS4 also boasts all-wheel-drive, while the M3 CS has all of its oomph sent exclusively to the rear axle. But ... the Audi is also a little heavier.
Check out the video above to see the two German machines do battle (in a "best of three" format, in fact), before going head-to-head in a braking test (and then a little time on the track)…