let me clairfy with an example like steve did.
now you know what, im willing to bet LESS people pull out infront of him. if me being obnoxious too 100 people alerts 1 inattentive driver then it is worth it. (think it goes without saying even though all you old geezers imply that it doesnt, that my life is worth more then your not hearing a loud sound. even if it's only a .0000000001% that it will help me stay noticed)
also people seem to think sound travels at 80 mph or something. the speed of sound is around 760 mph, that sound will reflect and travel forward faster then you travel. otherwise you would literally only hear a siren behind the ambulance even with them having forward facing sirens. now is it AS loud in front of as in back of? no. but my other points make this one irrelevant.
so to clairfy again, loud pipes OCCASIONALLY save lives, the rest of the time they ether sound awesome or annoying based on your personal opinion. and you are all entitled to your own, just dont go posting nonconstructive criticism in this thread, go rant to your significant other or your dog, they atleast fake caring about what your talking about.
EDIT: also another point, let say i want to alert everyone? not just cagers? i have a family member who almost killed a kid because their bike was stock baffled and the kid ran into the road because he didnt hear them coming, luckily his passenger was quick thinking and pushed the child back so he didnt continue running out under the rear tire. so i'd love to hear one of you say it was good he had it quiet and your reasoning behind it in that instance.

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