I just drove around trying to do some hard pulls and I think the intake is slightly louder, but perhaps not in a good way. The induction sound seems to be a little bit more high pitched than before, but then again it could just be a placebo effect.
I noticed it most when in regular drive mode (not sport), starting from a full stop, giving it enough gas to shift to second and pushing to 3/4 throttle which would force the rpms to ~3500 and then it'd automatically shift to third and release the excess boost (which also seemed to be a slightly higher pitch).
I highly doubt there are any measurable gains, but I'd be curious to see the data from a boost gauge for before and after.