Savatoon's done a really nice job with this edit of Texas World Speedway. It's got plates but it still allows for passing and some pretty good racing.The turns are a little wider to help keep the speeds up too. Change the default install to directory to include iowa at the end of the series. That way you won't end up with all the loose files in the track directory.
Updated version with billboards and other assorted goodies now available. It's under a different name so you can compare and keep the one you like.