"Forza Horizon has been getting a great amount of support from Playground Games and Turn 10. After having received a bunch of DLCs, the Top Gear pack DLC was the one that caught our attention.
The pack isn't something that adds a lot of content to the game. It just costs 400 MSP and is available for free if you have the season pass. The cars are just like the others that were included in the game. The physics applies to them but they aren't sim-type like Forza 4."