I have put heat insulation in a couple of places on my '89 Runner, V6. Mostly due to the Downey headers and exhaust system I have on there.

Locations:

Starter heat blanket from Summit Racing.

Self Adhesive heat blanket applied to the firewall and bottom side of the passenger side footwell where the header comes down.

Velcro enclosure heat wrap around fuel lines that run down under the passenger side footwell.

1" tube heat shield around front e-brake cable from the firewall to where it attaches to both rear e-brake lines, due to melting the stock cable with the header kit.

Mike