Compare the Caterham 7 Superlight R400 - [2003] vs BMW 1 Series M140i F21 LCI - [2016]. 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 Caterham 7 Superlight R400 or the BMW 1 Series M140i F21 LCI. We'll leave it up to you to decide which is your favourite.