Compare the Maserati Quattroporte AM337 2.0i V6 Bi Turbo - [1994] vs Ford Sierra RS 500 - [1987]. 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 Maserati Quattroporte AM337 2.0i V6 Bi Turbo or the Ford Sierra RS 500. We'll leave it up to you to decide which is your favourite.