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...and not add too much weight.
Dynamat 'small' pieces to the bare metal surfaces in the hatch area...including inside fenders, under spare tire, under center tray...etc. as well as inside doors. Will deaden vibrations that resonate in larger metal surfaces. If you can, remove all the plastic trim throughout the rear hatch area and go to it....
Add another hatch area rug on top of the existing one, as well as more padding of your choice under them both.
Add padding behind the plastic interior trim pieces covering the taillights....this area is where most of the road noise comes in! Pack it in there to capacity throughout the entire rear section of the hatch behind the plastic trim pieces.
You will notice much less high frequency noise.Another source of wind noise in the Z is from the outside driving mirrors. Disassemble the triangular plastic and pack it with foam where it attaches to the door. The turbulence sound will disappear. Nissan had a wimpy piece of foam in some of the mirror, and not in others for some reason. Guys looking to avoid weight, ignore this, but it's a nice compromise between totally dynamatting the vehicle like stereo-holics do (heavy) and gutting the car like race-heads do. The drive at high speeds is much quieter and less fatigueing on long drives. I've also used foam earplugs when driving with the t-roofs off on long trips at highway speeds. Turn the stereo up, too. Sounds great! And no wind noise!
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