I think it's safe to say I have more sound deadening in my car then all or you. I used 200sq feet of the MCmaster hi-temp mastic(comes out to 1.12/sq ft) and 120 sq ft. of dynamat super on all my interior panels and the doors. then I used 1/2" carpet padding on the floors and stuffed the rear 1/4 panels with 3 rolls of R-11.
there is no "overboard" on sound deadening....there's always another squeak or jiggle somewhere.... __________________________ ...just my $.02 95 GS