Once again I am seeking the input from the pros on this forum...Finally got my new boat in the water (winter sucks) with a new BF150...Ordered new with an S/S prop. Definitely not the quiet Honda sound I'm used to, its noisy down low, especially in reverse. Local Marine shop says S/S prop is the culprit. Anyone ever heard of this? Best described as a combination of exhaust leak, and light rhythmic tapping, along with slight vibration...seems to clear up with speed/RPM, although (when going forward) I need to trim down pretty far to get it to quiet down. Checked all the obvious stuff. It could stand to be lowered on the transom a notch (which I will do). This is my second Honda outboard, my BF90 (also a new purchase) had an aluminum prop & it was whisper quiet... any ideas appreciated, Thx folks!