Ok, so you'll probably want to go for the street class. Minimal mods are allowed, so keep that in mind if you want to stick to the class. Cat back exhaust, drop in filter (not CAI), struts/shocks, sway bars, and tires with a 140+ tread wear rating for 2014. That will change to 200+ for 2015. There are more allowed mods too, those are just the basics I can think of off the top of my head.
http://www.scca.com/news/index.cfm?cid=51652