Actually I think the boom box cars are a whole lot more abusive to my ears then any exhaust will ever be. I've had my vehicle literally shaking because of some idiot next to me with the subwoofers cranked into overdrive. I can't imagine what it would be like to actually be IN that car. They had to have blood coming out of their ears and other orifices!
(yeah, I definitely need to load more smilies in this site.....)