Check the 'expected cars' (can't remember exactly) list. Button next to Entry Requirements. It list cars eligible. But seeing as Subaru is Japanese. I doubt.
The car list you can look at next to the requirements are "typical opponents", meaning it's not necessarily the complete list of cars you can enter or will face. Check the requirements, if the Subaru meets them all you are good to go.
Should try a Audi TT touring car. I had no problem with that vehicle. Also I used it for the final race in dream car championship and got a silver after being spun out and hit a couple time out in the grass.