I wonder if the dip around 5300 rpms is related to a resonance at that rpm. I think seeing whether it is persistent after a tune will give a good indication.
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Car Sold! Pleasure being a part of the Z community. 
New ride: 2015 GT-R - 647 WHP / 641 WTQ (e85) & 543 WHP / 519 WTQ (91)
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