Right, i originally was thinking it was the S4 but then i remembered it was only the A4 with the 2.0. I remember Jeremy stating his Audi had half the displacement of the "American" Mustang.
No worries...
Mind, although Jeremy may have banged on about how the Audi 'only' had half the displacement, you gotta remember that it has a power adder(s) to keep up / beat the bigger car with the bigger engine. Makes the comparison somewhat 'apples to oranges' (I haven't seen the review yet, but I generally take anything Clarkson says with a pinch of salt)
May I remind Mr Clarkson that the Mustang has some things the Audi will never have: Iconic status and an aftermarket to die for!