Yep you can also change the wing on the Integra Type R Touring Car and the Mazda Atenza/Mazda 6 Touring Car. 👍
Also, more cars have been given the ability to be painted, such as:
Honda Element
Citroen 2CV
Honda Today G
Citroen Xsara
Anytime bro. From what I can recall, two LMPs can have their rear wings changed, one is the Audi R8 Race Car, and the other I think is a Pescarolo (not sure which one). The wing itself doesn't change in appearance, but it grants you 20 more "ticks" of downforce to the rear.
and 2) I can't see any reason why you'd need 80 downforce.
Still; that's an interesting find, even if I'll still end up using the default wing - I never try to change the wing on race cars for obvious reasons so I've never come across this.