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Cherry picking this thread in no particular order. Typing quick and not proof reading. Please don't anyone take offense if something doesn't come out right. None intended, just trying to contribute what I know.
Gold foiling the engine compartment will hold heat in, which is not the desired effect.
I installed the taller oil cooler (heat exchanger technically) in my S model when I had my engine apart. I see no reason why it wouldn't fit a non S car and could likely be done without even having to remove the intake manifold (keep in mind, I only own an S and don't know how different the intake manifolds are).
To the guy running two fan switches because one melted, you do realize that the job of a relay is to control high current devices with low current switches, right? You could probably patch one switch into the relay and not cook anything.
The idea of running A/C air into the engine compartment is funny. The act of creating cooled air with A/C creates additional heat than you started with (no such thing as a 100% efficient process, i.e. you can't open the fridge door and cool your house off because there will be even more heat pouring off the back of the refer). Where does it go? Well, the condensers which expel the heat to the outside world are positioned in front of the radiators, which would make them hotter. Circulate that a while and you'll exceed the capacity of the A/C system and you'll just be dumping tons of heat into those radiators. No bueno.
Back when my A/C wasn't functioning I could provoke the fans to run by turning on the A/C (which didn't 'know' it didn't work), just like the above user with the manual fan switches. It definitely worked in low speed traffic or sitting. Now that my A/C is recharged and working it doesn't really dip the needle at all.
My engine compartment fan expels hot air out the side of my car, not blowing cold air into it. It does not blow air clear across the engine compartment and through the "oil cooler". It would need a long duct in order to do that.
To get heat outside the car and on the way you would want to use a base plate like I've seen marketed by Pedro and run an external oil cooler outside the engine compartment. Ideally it would have a fan blowing on it, but could run a snorkel or in place of the rear spoiler. It wouldn't do much when sitting without a fan. It would also need to retain the stock heat exchanger (duh).
Again, I'm pretty sure there is room for the taller oil cooler AND the external oil cooler adapter plate.
My car heat soaks my garage. So does my VW Touareg V10 or any automobile with a large hunk of hot metal.
The part about high speed operation generating the most heat is totally true. Run any "super" car at WFO for not even very long and it will build up heat it can't get rid of. Witness what happened when Frederich Peich proposed the requirements for the VW Pheaton (186mph with a 72 degree cabin even at 122 degrees F outside, caused many of his engineering staff to walk out - so the story goes).
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