[Jim/GA]

The benefit is less heat radiating into the passenger compartment from the hot engine compartment through the metal firewall. It also reduces a bit of engine noise.

To get full benefit, you need to carefully seal off all places where hot air can flow into the passenger compartment. There are a bunch.

I have one on both of my cars and I think it is worth it. It's a lot of work to retrofit, but it can be done. Easier to install when putting the car back together during restoration. You have to remove every wire, tube, pipe, ignition cable, etc. that passes through the firewall before installing the pad. Then reinstall everything.

On my green car, I sprayed it with the same green body paint that was used on the rest of the car. If I did not tell you it was there, you'd never notice it.

My pad came with a bunch of extra-long screws to replace the inside stock screws that mount things. That's a lot of what holds it in place.

I can't think of any "cons".