Derp.
Think I figured it out, and don't know why I didn't think of this earlier. I think the rattling sounds are coming from the windows. Since they're kinda just up and not braced all that much against the car frame at the top, they rattle a little bit at higher speeds. Was hard to determine since the Z doesn't exactly have the greatest sound damping in it as stock.
While I was driving home the other night, I noticed the rattle again. But also realized that it was coming from the passenger side too. Was hard to pick up on that, since the road noise was making it hard to hear from that side of the car.
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2014 Nissan 370Z - Sports Package
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