Compare the Porsche Boxster S 3.2 987 - [2004] vs Nissan Silvia S15 Spec R - [1999]. 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 Porsche Boxster S 3.2 987 or the Nissan Silvia S15 Spec R. We'll leave it up to you to decide which is your favourite.