Compare the Mazda RX7 RZ - [1998] vs Vauxhall-Opel VXR8 Tourer 6.2 V8 - [2013]. 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 Mazda RX7 RZ or the Vauxhall-Opel VXR8 Tourer 6.2 V8. We'll leave it up to you to decide which is your favourite.