There is a used books store (if I recall) on Oak Ridge highway, between Karns and where OR highway joins Pellissipi Parkway, that has a track out back that they run races on Saturday, and I think open driving during the week. I didn't ask if they allowed nitro since I don't have one, but the guys at HT USA told me about it, and many of them run nitro, so I'd say yes, but don't quote me on that. Let me see if I can find it on the map....