Just curious, does anyone have a decibal meter or some sound measuring device to claim what is "loud" or "quite quiet"? I know that the iphones have an application (sorry it has to be jailbroken) that has a decibal meter and can read up to 180. If someone can get a reading of their cabin and list what item they have installed, then I think it will be a better reference than subjective opinion? I'm wanting to do the header and exhaust, but if I can't hear my thoughts when I drive I'm going to hit someone.