I drive my Z 60 miles a day, as a driver in heavy interstate traffic.
It gets to 7200-7500 at least twice a day. I generally drive the AT in M, and can shift it just before redline now by feel.
I did jump on it the other day thinking it was in M, but it was in D. I upshifted it manually by instinct, and it went to Neutral since the shifter was in the wrong slot. It went to 7700 immediately, since my foot was flat on the floor! This is not good - since there is no load on the crank. Hasn't seemed to have bothered it at all.
Keep good clean oil in it, at the correct fill level and temperature, and this engine will tolerate a lot of abuse.
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