I think these come in when turbos come in. I don't know when that will be but I think there are lots of forced induction cars waiting for an opportunity in IT. The turbodiesels are only a small fraction of those waiting in line ...

If anyone wants to educate me on turbo inlet restrictors, as done now in the STU class, their efficacy in terms of making power output predictable, and their side effects, please do! Because as of now I'm thinking that's the way to get them in.

Thoughts about supercharged cars welcome too.