Been reading a bit about the different classes most of the Regions have so they can fit random cars that do not appear under the GCR

ITE sounds interesting, but seems like every region has its own (similar) set of added rules.

We have a few cars interested in racing, but seems that is kinda difficult to accommodate, for example turbo cars,honda engine swapped cars or a 1984 BMW 325 Alpina.

As we all know, whithout having to send them to GT and spend the big bucks, what would be the options?
Our local classes are only in the IT and GT spectrum.

Thanks in advance