Originally Posted by 37Z

In my experience, the majority of the unwanted noise is from the wheel wells. Just tap on the rear wheel wells...the metal is thin!

Its best to remove the plastic rear hatch side panels that cover the shock towers in order to reduce unwanted noise entering the cabin.

First, the rear hatch rubber gasket needs to be pulled up to the top of these plastic side panels before these plastic panels can be removed. Next, the 4 plastic tie down clips need to be removed by inserting a standard blade screwdriver in the clip slots.

Second, the rear hatch plastic panel clips need to be removed before the rear hatch side panels and its clips can be remove. The rear hatch light need to be disconneted.

Third, the rear hatch side panels clips need to be removed.

Once all these rear hatch plastic panels are removed, the foam piece located in front of the space tire well can be removed so the sound deadening material can be installed on the steel car frame.

The other area of the 370Z that transfers noise into the cabin is the doors. The best way is to removed the door interior panels and remove the access panel in order to gain access the the back side of the door skins. This is time consuming and involves disconnecting the window motors and can have issues with the window tracks and window motors.

I would suggest reviewing the 370Z service manual that can be downloaded from this web site prior to removing the plastic panels. Also, a plastic panel removal tool is a must to prevent damage to the plastic panels.

Good luck!