We test the BMW M4 against the benchmark setting fast coupe, the Audi RS5. BMW M4 review: http://bit.ly/1lb81cD Audi RS5 review: http://bit.ly/1nD11rN Subscribe to our YouTube channel http://bit.ly/11Ad1j1 Subscribe to the mag http://subscribe.autoexpress.co.uk/yt The arrival of a new BMW M car is always big news for performance car fans, and the new M4 is no exception. Costing almost £60,000, the
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