i am trying to understand how loud pipes help. here is why, when you are in your car and you look in the rearview mirror and there is an ambulance with lights and siren going, when do you hear the siren. pretty much when they 2 or so car lengths from you, now this is a loud high pitch sound facing forward and you can't hear that how do the cagers hear low pitch pipes facing the rear hear you coming any quicker. just curious. I completely agree with the louder horns for in town trafiic use etc.