Heat soak with the KKM in Texas is a @#$%$#@er. It should be called "heat suck" since it is sucking hot air from the engine.
I find heat suck very noticeable in city traffic. It annoys me enough that I engineered a very inexpensive heat shield tonight.
I bought 3 90-degree angle sheet metal roof flashings, for a grand total of 90 cents plus tax. They are 4"x4"x8". I screwed two of them together to make a U shape with a base of about 6" (slight overlap needed).
I then cut out a slot wide enough for the intake to fit in (about 4" wide). I then took the filter off the car and attached the third piece of metal to the "underneath the filter" position.
Now I have 3 sides of a cube, with a slot wide enough to allow the filter/intake tube to pass through. It holds the filter captive, or maybe the other way around. I then took the tin snips and trimmed the metal to fit under the hood and also trimmed the lower portion to clear some of the chassis. I wrapped some adhesive weather stripping around the razor-sharp upper edges, checked for fit, and hit the road.
Took it out for a drive. The impact was very obvious. I didn't notice any hesitation at all, despite high ambient and underhood temps.
Once back in the garage, I checked the temperatures of the shield and the filter element. The filter was at roughly outside air temperature. Good. The shield was too hot to touch!!! I think we have a winner.
Woohoo!!!
