I have question about challenger Race in Game

We aren't here in a position to give you the authoritative reply you want, just an opinion.

Why we do not have Super and Hyper car tournaments:

i) there are only 7 days in a week, they would need to change the tournament structure (which would be a good thing, in my opinion, this is boring)

ii) there has been only a small number of players with Super and Hyper cars (which is of course changing)

iii) there is just a small margin between first car of the class and maxed out last car (I mean, you can have street car with <200 PR, while the top notch Impreza is over 700. That is 500+ points and +250% - on the other hand, when you get Viper, it is something like 650, while after several months of hard work you can get 950 McLaren. Difference being 300 points and less than 50 %. Lesser margin with Hyper cars)

iv) when you have a competitive Super/Hyper car, you are bound to have a good car in lower class as well. While the opposite is not neccessarily true. I know, kinda similar to reason (ii) above.

And new chapters? That would mean changing the level cap as well and too much work, guess they may save any possible new additions to special events.