Hulk311

Can you explain what you mean? If I was to seal the trunk and then drive on the highway pressure would build up in the car to the point of me being uncomfortable and having to open the windows?

I have a four door car and would like to sound deaden the trunk. I noticed my trunk has small holes where the spare tire is on the floor and on the rear bumper, on the inside, it looks like there is a pressure release valve. So when you shut the trunk the air has somewhere to go. What would happen if I was to completely seal off all of the holes withe dampifier pro and luxury liner pro and I was to shut the trunk? Would it just not shut?

Any advice on sound deadening an engine cover? I'm thinking of putting damplifier pro underneath it and either heat wave pro or thermal block on top of that? Would this be a bad idea, as in would it cause the engine to keep it's heat and build up temp to an unsafe level? Also, what would be the best way to lower the noise level in the engine bay? There is no way I can put damplifier pro or spectrum sludge on the engine bay firewall because there is already some sound deadening material there that is impossible to take off. If I just put a few layers of heat wave pro/thermal block on the firewall engine bay side would that work? Also, how about putting damplifier pro underneath the hood? What is the main difference between thermal block and heat wave pro and what are some examples of where you would put one and not the other? Thanks for any advice.