Compare the Vauxhall-Opel Firenza Droop Snoot 2.3 Litre - [1973] vs Vauxhall-Opel Monza GSE 3.0 - [1985]. 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 Vauxhall-Opel Firenza Droop Snoot 2.3 Litre or the Vauxhall-Opel Monza GSE 3.0. We'll leave it up to you to decide which is your favourite.