One last COA that I've also seen before is to mount the cooler on the inside of the license plate area between the tail lights, then do the same NACA ducting from the passenger side quarter window. Then you just need to make sure you protect the lines, etc. accordingly based on what the CCR says.

Having hot oil in the spare tire area exposes it to damage in a rear ender and hot oil can burn if there is an ignition source. As I recall, NASCAR brings air in through NACA ducts in the quarter windows with an oil cooler on the floor of the car inside a sealed box. I never saw where the air exits but assumed it exited through the bottom of the car.

I don't know if that is a great idea either but they seem to use it. I would personally look for a spot that is not as easy to damage.

Big Dog

I have been offline for a while and as one of the loudest voices for this new rule I want to chime in.

There are lots of ways to do this, some better than others and as you would guess with differences in cost.

The Hard/Expensive way:
This entails a multi-pump set-up or at least multi-stage. You can run a gear driven pump off the driveline of the car (axle or tourqe tube) which has the benefit of matching pump output with RPM and can be a multistage pump (like a dry sump pump).

The pickup off the tank then has the second pump or stage pull oil out to a multi-discharge return with nozzles spraying oil at the gear mesh points along the tranny (6 points for a 5spd). Critical is the R&P mesh point and to a lessor extent the rest of the gear pack. Nozzle diameter controls the flow to each point. The benefit here is that the oil aeration is controlled and oil is sprayed where it is needed vs all over the place as with a wet sump set-up. Cost $2000

I will be running a Tilton pump with a single pickup in the drain plug, AN fittings with AN stainless lines (for the safety of it) and one well placed return to spray the R&P (I may add one more in the tail cone but not sure yet). The cooler will be a Setrab unit of reasonable size with no fan just some ducting to it and from it. I can do this for $400 or so. It will take me less than a day to hook it all up (If I can fine the time! Still need to do the cage for crying out loud!).