It was a rough weekend at the track, I'm doing repair work today. The
cracked and crunched fiberglass bumper has some foil backed insulation
on it that is going to get destroyed when I repair the bumper, where to
get some replacement?

The insulation is about 1/2" thick, has a very heavy foil on one side,
not sure if it has anything on the other side, fibers are white and
fluffy (ceramic?). The stuff is needed to protect the fiberglass bumper
from the muffler so it needs to be pretty high temp.

I've tried McMaster, westMarine.com and came up empty. What do I search
on, what do you call it, where can I get a couple square feet in a hurry?