I just finished Dynamatting my Passat doors tonight. Two layers on
the outer door skin, two layers on the inner sheetmetal, and one layer
on the inside of the door panel. Thats 5 layers per door, times 4
doors = 20 Layers !! (100 ft2)

This concludes a month-long project. What a pain in the ass! The
results are noticable, but certainly not incredible. For the average
system its just not worth the time...