Compare the BMW i8 1.5 Turbo Hybrid - [2013] vs Seat Ibiza Cupra 1.8 20v Turbo - [2007]. 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 BMW i8 1.5 Turbo Hybrid or the Seat Ibiza Cupra 1.8 20v Turbo. We'll leave it up to you to decide which is your favourite.