Check out the current CCR and Atlanta Region ITO/ITU rules at the link provided by Tom Sprecher in post #2 above (I'd repeat the link but I'm pretty much computer illiterate). A true SPO car (tube frame, slicks, no limit to cubic dollars spent) would obviously totally outclass any car based on a production platform, which is why we wanted to provide ITO/ITU for guys that have modified their "street" cars beyond what is allowed in the ITCS.
Butch Kummer
Former SCCA Director of Club Racing (July 2012 - Sept 2014)
2006, 2007, 2010 SARRC GTA Champion
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