you don't run a dump pipe on a normal bike. You need the backpressure of an exhaust system.
If you have a turbo you can run a dump pipe and they aren't that loud. I would say comparable to a harley at most. A loud harley is louder than my dump, and mine sounds much cooler.
Thrasherfox just cut his midpipes, he just running a straight pipe. He bought a power comander and a map from Johnny Cheese(I think) and it runs great. LOUD!!!!! PM thrasherfox for details.
Running a header alone is much louder than a dump pipe...I've heard a Muzzy Sidewinder and it's louder than a dump pipe also...I don't think a dump pipe will put you in violation of any noise ordnance statutes...As mentioned prior dump pipes are for turbo applications...
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