There have always been a few cars that I would love to see in the horizon games. The RS6 and MK7 Golf R were 2 of them and Im VERY happy to see them in FH4!
Just a few ideas below:
BMW F80 M3 2015 Onwards. Could possibly have a body kit?
VW Golf GTI MK7 - MK7.5 DSG. I would to hear the DSG pops and bangs in the game!
VW Golf R420. Looks like its just a concept at the moment, same engine as the RS3, would sound great!
Lamborghini Huracan Performante
Jaguar XJ 2015 Onwards
Just a few, feel free to add some more, just some I would personally love to see in the game 