I can describe the power difference. I'm her husband. It used to be when you got much over 4000 RPM there were all kinds of cues telling you to upshift. On our shakedown run, I was bombing along , engine singing happily in 3rd gear, and I thought 'I'm going pretty fast for 3rd gear' and I looked down and saw we were doing 5000 RPM! I'm also easily bouncing off the redline when hammering from a stop and getting rubber in 3 gears! We did not anticipate such an improvement.