There are some serious enhancements or mods going on now. Last year I removed the 4 screw heat shield common to the fwd surface of the rear bumper. Aligned with the 2 open slots in the bumper, I cut the shield and welded-in mesh material. This allows a small increase in the removal of captured heat from the rear area of the engine compartment. Remember, the heat collects just under the trunk base common to the battery area. Not a big deal, but then it costs a few bucks. Will try to upload pic.

Just a thought.

http://i211.photobucket.com/albums/b...heatshield.jpg