Because they are Lego replicas of real cars I put together with the help of Youtube videos, albeit with some differences.

The two black cars are meant to be a Lamborghini Diablo and a Koenigsegg CCGT. The middle two are meant to be a Lykan Hypersport and a 1970 Chevy Monte Carlo. The back two are a Dodge Challenger Hellcat(which still needs a little modding) a tuned Scion XB.