I think the idea of a "registered and insured" but that may cause issues depending on where you come from.  What is legal for a pre- emissions car vs. a new car or in PA isn't the same as in NJ!
Maybe some type of "street car" and "Race Car" heads-up classes could be done based on tires, electronics and mufflers?
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93Z M6 Black: The 385 Lives! Supercharged, 3-core front mount intercooler, GTP heads, 3:73's, Street twin clutch, Jethot Longtubes, Mufflex 4" catback/spintech, S+W cage, Spohn Suspenion, Yada Yada Yada
1) Build it
2) Race it
3) Break it
4) Repeat!!!
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