QUOTE(MikeSpraggi @ Feb 16 2011, 08:29 AM)
My engine is a 2.2l six, not quite stock, but almost
For a small /6 like that, you should be fine to hang the cooler in front of the trunk directly in the air-stream and not vent into the trunk at all.
Some of the early GT cars did just that, the cooler is simply mounted under the bumper. If you run a custom "lip", you can even divert any warm air off to the sides and prevent it from getting under the car.
No cutting the trunk and no additional warm air under the car ...