The hardest, fastest M4 that has ever been has arrived in the shape of the M4 CS, which sheds weight, increases power and activates just about every performance add-on you can think of. In less happy ...

The 'standard' M4 is powered by a 3.0-litre six-cylinder turbo-petrol engine producing 390kW/650Nm, with the M4 CS pumping out 405kW.