Compare the Audi A4 RS4 4.2 FSI Cabriolet - [2006] vs Iso Rivolta IR 340 5.4L V8 - [1962]. Find out which car is the fastest, most powerful, lightest or has the biggest engine in our top trumps style comparison page. Find out which car has the highest top speed or is the fastest accelerating, is it the Audi A4 RS4 4.2 FSI Cabriolet or the Iso Rivolta IR 340 5.4L V8. We'll leave it up to you to decide which is your favourite.