The new BMW M4 CS occupies the middle ground between the standard M4 and the M4 GTS. But can some exotic weight-saving parts and a slight uplift in power to 454bhp justify a near-£90,000 price tag? Subscribe now: http://smarturl.it/autocar

We take a closer look at the M4 CS on the UK's roads to find out whether it's the pick of BMW's M4 range.

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