I just put down the Second Skin product in the rear portion of the car and it made a little difference, but none to justify the amount of labor required to put it down. FYI: Pulling out the molding and trim in the back of the Z is a breeze. The only trick is learning where the pressure clips are so you pull in the right place.
I think I bought the Damplifier Pro 20 sq ft pack and still didnt have enough to get every little nook of the trunk. If you plan on doing the front of the car, I'd suggest much more than 20 sq ft.
NOTE: I'm not dissing the Second Skin product, I just think more sound comes from the front of the cabin and doors than we think.
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