I like quiet.
My buggy is loud. I run a small "muffler" I bought from Tim back in the day (more of a resonator really). I'll be trying to put a Hushpower II or something in some day so it's not no ungodly at 2k+ rpms.
My 7.3L is loud, I'll be doing a full interior 3 stage sound deadening when I get the change. Hours upon hours of towing in this, and quieter would be pretty nice.
My 2001 XJ I'm building, I did a 3 stage sound deadening, and put on a quieter muffler. This will soon be my DD, I'd prefer to hear the new stereo system I'm putting in over the road noise and motor
Then again, if I had a V8 for fun...it would probably be a little different story