The Audi RS5 is a seriously impressive piece of kit. It's stylish, it's luxurious, and it's very, very fast. But the same can be said of the S5; a car which has slightly less power, more subtle styling and - crucially - costs the best part of £13k less. So does that extra 'R' on the boot lid justify the extra cash? In this video, I'll test their performance, handling, and even consult the opinion
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