Ideally, yes, a power bump would be ideal...but a bit of noise would be helpful as well.
When I drive spirited or when I do track days (none on this car yet), I drive (shift) by ear and not by the tach.
I have discovered that my sti, even with the q300 cat back is really quiet and hard to tell exactly what the motor is doing by ear. I hope that makes sense.
But I don't want something that is annoying Loud all the time.