nice write up! I have the power kit and exhaust as well and I agree to your findings. I personally love the sound, and I got a lot of possitive feedback, even from strangers. Accelerating next to buildings / a wall or in a tunnel makes me smile big time. I just open the window a bit to enjoy.
I really appreciate the exhaust doesnot drone. It is no problem to drive 300 miles in one go. One point to mention. After driving it for about 11.000 miles now, there is a sligth increase in noice in the cabine around 3000 RPM.