Compare the McLaren MP4-12C 3.8L V8 Twin Turbo - [2011] vs Ariel Atom Mugen - [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 McLaren MP4-12C 3.8L V8 Twin Turbo or the Ariel Atom Mugen. We'll leave it up to you to decide which is your favourite.