Audi would probably prefer you not to realise this, but the five distinct versions of S4 and S5 on the market all pertain to a single performance and equipment formula spread across five different ...

Are you looking to buy a car but can't decide between a Audi S4 or Citroen Grand C4 Picasso? Use our side by side comparison to help you make a decision. We compare design, practicality, price, ...