Tony,
Would it be at all possible for you to grab a decibel meter and give the community the results of various configurations vs stock. I think that would help inform your buyers, resulting in even higher satisfaction. I believe you can get one at Radio Shack if you don't already have one. As a marketing tool, I believe this is a great idea and other manufacturers have been doing this for years since there are strict laws in some areas.
Thanks again for all your hard work in satisfying the pickiest of car communities.