A full socket and wrench set, screwdrivers, and a selection of pliers is my mandatory list. I am trying to get mine where I don't take anything but a tire gauge and hand held inflater. I need to break free from the tools or get a little trailer, i don't trust leaving my tool box and stuff in a pile in the pits as much as I used to. Street car problems!
I should also add that I don't like to work on my car at the track. Short of changing tires I very rarely ever put a wrench to it that is not in my garage. That is one of the perks of EFI, it motivates me to do more tweaking and testing and I never have to get into the tool box.
