Compare the Ferrari F40 LM Competizione 2.9 V8 Twin Turbo - [1989] vs Mercedes SLS AMG Black Series 6.2 V8 - [2012]. 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 Ferrari F40 LM Competizione 2.9 V8 Twin Turbo or the Mercedes SLS AMG Black Series 6.2 V8. We'll leave it up to you to decide which is your favourite.