Performance Class

When choosing vehicle filters, there is a filter called performance class. If I want two cars from the same performance class, I choose just one class, but when I click on a vehicle, it brings me to all the different setups, and none of the specific variants say what performance class they are in, except the pigeon. I'm not very good at explaining things but here are some pictures of what I mean...
As you can see from the screenshot, the Pigeon has a performance class filter, but every other car doesn't. For some reason I recall all the others having a performance class at some point as well, but I might be mistaken. If you're wondering why I want these sorting classes is because I want to compare vehicles from the same performance class.
Thanks in advance,
Binkey.

-----EDIT-----
Forgot to add a question...
Does anyone know how to preview which car is in which performance class? Even if its outside of the game, like looking into the files?

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Sorry for the troubles everyone, I figured out a way. Maybe I should try to do things myself before making a new thread.