This is one of the coolest races I have ever seen. Dave Coleman who's writing for this site talk all about euro rally cross and what makes those motors work with videos of the fiesta in Sweden and pikes peak. And yes, Miata is the answer (engine anyways).
http://www.motoiq.com/MagazineArticles/tabid/59/articleType/ArticleView/articleId/1289/Inside-the-800-hp-Olsbergs-Ford-Fiestas.aspx
Enjoy
