Unless you have anything like F/I or an LSD, you can probably run STS. If you have an LSD, then you're in STX. I'd run the street touring class for a day even if you have engine tweaks like no precats, just because the competition is much better. If you're going to really get into it, then you'll want to make sure you're abiding by the rules, but there's an unofficial "no weenies" rule in the ST classes, so I'm sure no one would care about a few minor points. The odds of you beating many people your first time out is slim in STS anyway, and no one ever complains unless they lose!
