Hughs,
The sound is not offensive at all if you enjoy hearing an engine really doing it's thing. The other day I was flying my Morris Knife w/MVVS 45. I cranked it up and brought it up on the highspeed side. About all 20 of the other people present stoped and looked.....several ambled down the flight line and watched. Later they showed a lot of interest in what was making the sounds. None had really seen this set-up and showed a lot of interest. Try it you will like it, lots.