[DanEC]

I used B-Cool mats on my aluminum panels, mostly for dampening but some heat reduction. On my fiberglass foot boxes, in addition to the facotry ERA foil surfaced insulation on the firewall side - I added more to the underside of the foot box (I have undercar exhaust) and the fender side (I assembled the car so I had access). On the inside I used EZ-Cool on the inside of the foot boxes including the top area. EZ-Cool is principally for temperature protection and not primarily a dampening product. It's also very light so using as much as you need isn't going to add by a couple pounds to the car.

My car isn't on the road yet so I don't know the final results but anyway - another suggestion and 2 cents worth.