BMW M4 vs Audi RS5: epic track battle

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

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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 replacement for the legendary old BMW M3, the M4 has moved away from the V8 power plant in the