At R3E's Steam page,there is 7 DLCs. I wonder do they work? If they work, how can i learn about those listed cars' classes without buying. For example BMW Z4 GT3 is in 4 different classes and most of the servers i'm interested in use GT3 cars but I'm worried if its class is different. And if you bought any of the DLCs,could you inform me how does dlcs apply in game? Thanks.