This is a list of cars i think should be in FH4,
-Peugeot Onyx
-Mercedes-Benz SLR Mclaren
-BMW M3 GTR
-Koenigsegg CCX
-Lamborghini Egoista
-Lamborghini Asterion
-Mercedes CLK 550
-Bugatti Divo
-Tesla Roadster
-Chryslus Rocket '69
-Mazda Furai
-Saleen S5S Raptor
-Audi R18 TDI
-Porsche 962C
-Pagani HP Barchetta
Thats really all of my Suggestions, Really hopes some of these get into the game