That's really nice stuff. I'm going to pick up at least on roll of the ULTIMATE material.

Get the v-comp too. You could use the v-comp as firewall with some spray adhesive. The v-comp is sold in sheets but I didn’t have enough to do firewall as well as the floor and tunnel. I should have bought more. Great products.

I finally gave up looking for new firewall material. I just scrubbed the rubber surface to get it super clean and set the insulation side out in the sun. After installing the sound material, the original one went back in. 

I just hope the faint musty smell doesn't come back.

12 hours ago, Car54280ZX said:

I just hope the faint musty smell doesn't come back.

Smells like a Z to me.