Before you spend any more money on mat check out this site.
http://www.sounddeadenershowdown.com/conclusion/There is a complete write up on the different manufactures of sound deadning materials and the pro's and con's of each one. After reading the reviews I went with the RAAMmat BXT,
http://www.raamaudio.com/cgi-bin/index.cgi?p=prIt's an excelent product and Rick, the owner, was quick to answer all of my qustions.
