Compare the McLaren 625C 3.8 V8 Twin Turbo - [2014] vs Pontiac Firebird 455 4.7 L V8 - [1971]. 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 625C 3.8 V8 Twin Turbo or the Pontiac Firebird 455 4.7 L V8. We'll leave it up to you to decide which is your favourite.