I need some GM Technician help. I am preparing the car for track days on a road race course and looking into adding a little bigger oil cooler with a thermostat. I have looked at pictures of the oil cooler assembly that is on the car, which I have attached to the post, but I can't figure out how it actually works. If anyone can explain all the channels, the 4 holes in the cooler, and if it has a thermostat, I would be happy to do that over the phone. Aside from fabricating a new plate, does anyone know of a way to tap into the system to add an external cooler?