Take the B7 Audi RS4 Cabriolet. While it shares the same wonderful, 414bhp, 4.2-litre V8 engine as the saloon, in the Cabriolet this engine has an extra 195kg to lug around thanks to the extra ...

You may be familiar with it from the B7 RS4 and the original RS5 ... a crown-gear centre differential and Audi’s torque-vectoring Sport rear diff. The RS4 weighs in at 1795kg.

Few performance estate cars can claim to have quite the heritage of Audi’s RS4. When it stormed onto the scene in 1999, resplendent in bright yellow paintwork, it was a bit of a revelation ...