Very slight vibrations in the Z between 50-60 mph. I only noticed it because the highway by my house was just recently paved and it was smooth as silk until this weekend.
Suspension seems to be in good order with no visible issues, but at 110K miles with lots of hard driving, it wouldn't surprise me if something is on the way out.
Before I start throwing money at it, I think the first thing I will do is have Discount Tire check the tire balance for me. Then I can have NTB adjust the alignment if necessary. Neither will cost me anything other than time.
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2011 370Z 6MT Sport Gun Metallic | ARC | CJM | Ecutek | FI | Fujimura | R2C | SPL | Stillen | TWM | Z1 | ZSpeed | |