I used Raammat sound deadener and their insolite foam mat on top in the hatch and doors. I had extra so I went a little overboard in the hatch but I'm pleased with the results. I wasn't trying to make the car quiet (the Z will never be quiet) but rather make the car sound and feel more solid, and it did just that. Driving over rocks no longer makes the 'ping' noises and the stereo sounds much better. I did this back in 2013 and have since added an exhaust. I think the deadener really helped cut unwanted vibrations in the hatch floorpan as well.
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