There's a huge difference between careening around some cones in a parking lot and making a fast lap at Laguna Seca. My wife's nephew is an autocross guy and thinks his Escort is a race car because he routinely beats Corvettes and Mustangs at autocross. Like most autocross guys, he's living in a fantasy world.
LOL...I have a couple of friends into that, and I have to admit, one of the most boring spectator events ever devised. The only people getting anything out of it are the people behind the wheel.
Mustang panels on a Miata? Blech. It's like those Ferrari kits cars that are Fiero based.
Double blech.