Everything is normal. When you downshift the 370z blips the throttle so you don't lose momentium which is that "kick" you feel with the engine roaring. The 6 speeds have the SRM which pretty much does the same thing but it's new to the manual world. Auto's have been doing this for sometime now.
So in short, it's not going to ruin your engine... it's designed to do it. Keep the needle out of the redline when you downshift and you'll been fine.
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