+2 to realizing that a class inspection would be a huge PIA and not practical. Thanks for that note as I hadn't considered it.
Mostly minor stuff, like lowering springs, coil-overs adjusted lower than stock, rear sway bars, strut braces, performance headers. Nothing that is adding monstrous power but after you lace a few mods together, you can start to eak out a pretty large advantage.
This is sage advice. Though, I'm also totally new so I could be in the wrong so I don't want to say anything. Also, I don't think I'm hugely competitive so I'd end up being that guy for nothing.
Just to recap: In RTR you can mod front sway bars, cat back exhausts, remove anything not affixed with a permanent fastener and change out to adjustable struts - yeah? Like I said, I could be totally off since I'm also new.