I get these two symptoms on my MY10 R36 also (Aug 2009 build).
I always thought the "thumping" sound is normal as I also heard it on the demo car I test drove.
And mine also has the delay on upshifts (I use manual mode 99% of the time). I'm trying to work out if there a certain rev range it happens in, but so far it seems pretty random.
So you guys are saying these symptoms are not normal? Anyone else experience these issues?
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