Compare the Austin-Healey 100 SIX BN4 - [1956] vs Vauxhall-Opel Manta 1.8 GT - [1982]. 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 Austin-Healey 100 SIX BN4 or the Vauxhall-Opel Manta 1.8 GT. We'll leave it up to you to decide which is your favourite.