I have just finished putting sound deadener on the ceiling and floor (and firewall), as well as under the pillar trim pieces. I have noticed reduction in road noise but its still pretty loud. I had only put down 45 mil mat instead of 60...which may have something to do with it...im not sure. WOuld doubling up help significantly? I really dont want to have to completely disassemble my car again. Tomorrow im doing doors and trunk...hopefully i will notice more quietness after that.