Wow that is weird, it could be anything, I would take it in to your dealer ASAP.
My opinion would be, it sounds like leaky exhaust system, because my old 280zx
made similar sounds, I had it check out & the muffler guy found a small hole in exhaust pipe after the cat. In you case it could be either defective seals or if you ran over something it may have puncture a small hole somewhere in the syst.
Let us know the updates,
Znism11
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