Following the great posts in this forum and elsewhere I upgraded the stock speakers in the front doors of my Punto. I used PolkAudio DB 651 co-axials. I had to dampen the doors after upgrade because doors started rattling after upgrade. I used one layer of dynamat xtreme on the outer and inner skins of the front doors. As a side effect road noise has reduced dramatically. I have few more dynamat sheets left over. I have become greedy now for further noise reduction I need some expert advise - should I use it on the rear doors or on the front side floor/kick panel area. Where does it give best noise reduction? Please advise.