I'm bringing this back from the dead. Any new ideas on this subject?
The stuff we are talking about has an aluminumized reflective surface. The stuff essentially gets glued to the OUTSIDE surface of the trans tunnel and firewall. The reflective surface reduces the transfer of radiant heat (from the exhaust, engine, trans) to the area behind it
If you install it under the car / outside the cockpit, it reflects the heat before it gets absorbed by the sheet metal which then heats up and acts like a radiator radiating the heat all over the interior. You can tell just by touching it.
I installed this stuff to my outside firewall and tunnel back to about the front of the seat. My feet and leg don't feel any heat.........