Wow. That rulebook site was very helpful. I need to get my own, I know.
So, what I gather so far is that ESP is out, at least for me, for now.
Also, just to clarify, G-stock prohibits racing tires? Did I read that correctly? If that's the case, my choice should be easier. If I run "as is," I'll be in STS by default. May not be the most competitive, but I'll probably still have a big grin on my face when I'm done.
Or, I could re-install the stock airbox and go run GS, and do nothing else (except tires) to the car.
OK. Last question (I hope). For those of you running GS or STS, what tires are you using, or would you recommend?