I've been wanting to try using a insulating coating called nansulate as a insulation for my engine. It's supposed to create a r-13 insulating coating on the engine to hold in the heat. I'd like to coat the intake first and go back to the engine to try to keep track of its temperature to avoid overheating.
If you can keep the engine temperature down by controlling the intake temperature I believe it could go towards improving the engines overall efficiency.
Here's the product I'm looking at
Heat Shield EPX4 Insulation Coating | Industrial Nanotech Inc.
I'm also wanting to see about putting a water cooler setup in line of the EGR to cool the gases and also see if I can use it to "inject" around 7 gallons of water into the engine in place of water injection system!!