Sounds like a worn pilot bushing, The pilot should be changed with the clutch, Sometimes you can get lucky and it won't make noise but for some reason the 370Z is inherently bad for pilot bushing noise if you do not change them, I have seen this MULTIPLE times with the 370Z from customers that though they could get away without changing it.
Pilot bushings will grind/howl when you are starting to release the clutch, They can also make noise at idle it rare cases.
It's included in the clutch and takes 2 minutes to change, No reason not to.
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