forza-horizon-2
In other Forza games, especially motorsport, Upgrading your car to a different class will disqualify it from certain championships. It seems in Horizon 2 that cars themselves are part of the championship (R35 GTR belongs in supercar championship).
Will it stay as a supercar as I upgrade? Will opponents match my upgrades or will I race against class As as an S2? Haven't tested this myself as money is a little tight and upgrades can be costly.
Unlike Forza Motorsport 5, You still need to purchase the cars in the carpack with CR (First time is usually free). The Day 1 carpack for example are all cars already purchasable as you play through (for the same price as their boring counterparts), but they have a unique livery on them. Purchased Carpacks may be different. I haven't spent enough time in the carshow to be sure ;)
EDIT: It seems there was server issues at launch and car rewards may not have been given out.
Once the servers are stabilized, we will then get to sending out payouts for
loyalty rewards cars, Forza Rewards payouts, etc.
Yes it can. I have just confirmed it. The game will say that you already own it and you will have two options: Sell or Add to garage. See the screenshot I took below:
Best Answer
No. Upgrades and downgrades will not affect your placement in the championship. Opponent Drivatars will always match your class level plus or minus around 10. Even when you enter certain races, Ben (the event coordinator) makes sure and says "pick what you want, I'll make sure your opponents drive similar cars"