I have a jetboat with a 540 cubic inch Chevy. Some A-hole in a surf boat sunk it a couple years ago and I haven't gotten around to fixing it...I love the sound, my family on the other hand MUCH prefers our Gekko...something about being able to have a conversation...like you can't do that on land or when a skier is getting in the water?
I have a Denali with a 6.2, and one of the things I like is that the sound is the best of both worlds...rumble at idle, but quiet in the cabin and a little noise when you step on the loud pedal. Personally, if I had a newer ski boat with a 6.2, I wouldn't mind a little sumpin if I was on a public lake.