Camaro Cup was a race class in Sweden with only Camaro cars competing with each other that lasted 1975-2013.
Sharing an article that includes a video of mostly gen2 cars and some gen1 racing, and a link to FB with gen4 cars racing.

https://www.roadandtrack.com/motorsp...sweden-racing/

https://www.facebook.com/americanspeed.sweden/videos/camaro-cup-s%C3%A4songen-2006/621491111906735/