Compare the Subaru Impreza WRX STI 2.5 Turbo - [2017] vs Ford Mustang Hardtop 289 4.7 V8 - [1965]. 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 Subaru Impreza WRX STI 2.5 Turbo or the Ford Mustang Hardtop 289 4.7 V8. We'll leave it up to you to decide which is your favourite.