Dealership transmission and ECU software update? Affect on UpRev tune?

PW370z

I had a reflash done on my G37 like 2 years ago. It was supposed to make the throttle response and shifts smoother. It did what it was supposed to, but the car seemed to have lost some aggressiveness. I personally liked the more aggressive throttle response and harder shifts. I shouldn't have done the dealer reflash. When Infiniti says "Improve" they usually mean make everything softer, as the majority of their customer base wants this. Maybe you should go to the Infinit M forums, and see what other members say about the reflash. It may not even be worth it, and then you don't have to sweat the whole UpRev tune thing.