Door insulation
http://www.mamotorworks.com/corvette-1-106-7972.html
The price is definitely right. Curious how good a job it does.
That said, it's just 1/8 closed cell foam. It's not dense enough to be a noise barrier, and it's not thick enough to absorb any useful noise, either. On top of that, most of the interior noise is from the tires. Even putting sheets of lead in your doors won't help with that.
This could work as a gasket between door card and door, if you are having rattles from the contact of materials. Other than that, it really isn't going to do anything for you.










