Technically Rebellion would be in the ESR class. ESR for sports racers and ES for silhouette/production based are unlimited classes. I just love the machinery that race or have raced.
HPD CR-Z (with turbo and hybrid motor), Acura ILX, Lexus IS CCS-R, Mazda 6 Skyactiv Diesel just to name some of the factory entered cars.
Home-built and one-off creations including a 500hp twin-engined Mini Cooper, privately entered Ford GT, various sports racers including one with the Hartley V8 (two Hayabusa engines, one crank), TFB Monster (a tube frame race car with BMW engine and components and half a stock car body.)
Kit-cars turned race cars: Factory-Five GTM, Superlite SLC, a car called a Catfish (a Miata with an LS3 engine and heaily aero modified body).
And of course the many Miatas and BMWs, Porsche cup cars, Audi R8s. I get too giddy just saying all this
Edit: I forgot there was the Audi TT RS that came from the VLN. Rotek racing.