I don't even get why there are like more convertibles in the game that have the top forced on than not. It's not like there is a modelling issue or something that makes it difficult to model a car without a top.
You go through the game thinking there is a reason why in the thumbnails and NCD presentations the convertibles have the top down, but top up when you race. Then, you see a California or something and get overtaken because you were too busy scratching your head, trying to see the logic as to why.
IMO, the California looks good wing or no wing, but if I had to choose one or the other, I'd choose no wing. It doesn't really need it anyways.