How much will that crap weigh, Although I'm not racing my car at the drag strip, I'd like it to be quick and I might race someone here and there. Is this stuff really heavy or what? How much to do my trunk, I'll have two pyramid(crap, I know, I deal with what I have for the time being) 10's in there. If i could do it with 30 sqft, that'd be nice because then I could do the doors and trunk for $80. Do you think 30 sqft is enough, to atleast do the trunk lid. Also what's this about carpet padding, alot of people use that. I actually plan on buying some for when I build my sub box, I'll put it behind the vinyl to give it a better apperance. How much is that stuff and I have heard of people using it for deadening, what's that about? Thanks alot for all the help.