This would have been a battle of naturally aspirated V8s not too long ago, but the new BMW M4 is powered by a twin-turbocharged 3.0-litre straight-six with 317 kW and 550 Nm of torque. The Audi RS5 retains its 4.1-litre V8 with 331 kW and 430 Nm of torque. They are direct competitors and the debate as to which of them is quicker is no doubt heard in clubhouses, bars and braais around our country. AutoExpress took the rear-wheel and all-wheel drive sports coupe rivals to Blyton Park for a time-attack battle.
