Compare the Pontiac GTO 6.4L V8 - [1966] vs Bentley Continental GTC 6.0 W12 Cabrio - [2005]. 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 Pontiac GTO 6.4L V8 or the Bentley Continental GTC 6.0 W12 Cabrio. We'll leave it up to you to decide which is your favourite.