The "old" SCCA track in Topeka, KS is pretty centrally located. I'm not sure of any "twisties in the Heartland, tho. The "Safety R's and R's" might be rather prohibitive for some, too.
Regards,
se7en
Any member needing parts or assistance (in the Seattle area) for their x-flow engine, please contact me. BTW, if you are into Crossle' or Swift, we have a great group of drivers/mechanics in Burien, WA.