Firewall Insulation Material??

Hey Everyone. I am looking for a good quality insulating material for
my firewall. I am interested in something that will effectively block
sound and heat. I've looked at what Spruce and Wicks has available but
I'm wondering what some other builders may have used that has worked
well and is relatively easy to install. All comments and leads
appreciated, especially anyone that has flown their application and is
happy with the result.

I guess I need to insulate the rest of the airplane too, so any
comments on that are welcome as well.

Thanks. Don...