I've not been there on Wednesday nights for quite some time, so don't know what kind of crowd shows up. However, from their facebook page, it appears it's a mix as they have the older drag guys running the 1/4 mile and the ricers running a drift course in the parking lot.
No matter what the ET, I think it smart to wear a helmet. They typically run Wednesday, Thursday and Friday's as far as I know. This weekend, the Fun Ford event is there, so the schedule may be different.