Just throwing my 2 cents into this ring I guess. I have been riding motorcycles for about 35 years and have owned and ridden most types. Rode a 1986 shadow to Ft. Lewis WA from the UP, Highway 2 all the way out. I now ride a Harley and have put over a 100,000 miles on a few before I traded them in. Yes a Harley with over a 100,000 miles on it without touching it other then plugs and oil and other wear parts. I do not have loud exhaust on my Harley but I have had it on a few of them. I can tell you honestly that when you are riding a quiet 1100 shadow cars merge on top of you, come into your lane etc, when you have a bike with something someone can hear it does not happen. It is safer and that is a fact from someone that has close to a half million highway miles. I tour the country and I just do not want to have issues with people and I want to be respectful in the campgrounds I pull into so I choose to not run loud pipes. I just got the wife her first Harley this summer and the pipes rumble on hers and I did it because I worry about her being on the road to work and back. I did this because I know in my heart that it is safer for her to be heard by others on the road. It is not so loud you cant stand it but you can hear it. I do not want to argue with anyone or tell anyone that they are wrong, I am just stating what I believe to be the truth. Hope that helps.
Paul