Compare the Jaguar XF 4.2 V8 Supercharged - [2009] vs Pontiac Firebird Formula W96 Ram Air - [2001]. 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 Jaguar XF 4.2 V8 Supercharged or the Pontiac Firebird Formula W96 Ram Air. We'll leave it up to you to decide which is your favourite.