Ron,
Check Factory Five’s website for their spec Cobra. It runs in NASA in a spec class and is also competitive for endurance racing. The cars are a lot faster than a spec Miata and cost a little less. There is a lot of information on the website:
http://www.factoryfive.com/ . They also have a forum for FFR Cobra spec racers at:
http://www.ffcobra.com/ubb/ultimateb...ubb=forum;f=19 .
It is also streetable in most states.
Kevin