The EC145/BK117C2 has turned out considerably quieter than the earlier BK's.
Not sure how they did it, a clever tweak of old technology it seems.
All those years [and mi££ions] going down the road of high pitched screams from fenestron's and hiding the fan inside the fuselage to get a measure of quietness and the old technology seems to have largely overcome the problem and ended up almost as quiet as the new technologies.
Still chop your head off if you get too close though! Good job its nice and high on the 145 - and unlikely to be so quiet as you will not notice it!