You need to get down too the shop that sells all those pointless loud
sterioe that make the little hairs in your ears fall out and ask what sort
of sound deadening they have.

WE have various types over here such as Brown Bread. Its a pain in the arse
to put in and will require the stripping out of the interior. Its then cut
to size and Heated up and pressed into place with a hair dryer or roller
usually. But it works the bollox.

Gary

www.partsexpress.com
look under car audio for dynamat and like products.