When it arrived in 2016, the M4 GTS was the fastest production BMW ever, with a top speed of ... plus a carbon fibre bonnet. The titanium exhaust saved 7kg and the rear seats were thrown out ...

In the middle was the BMW M4 CS ... to that of a 2018 M4 Competition Pack. The only mechanical change to the powertrain is the fitment of a more free flowing exhaust system.