The pipe doesn't seem that much louder to me. Alot of other gixxer owners don't care for it either, so Muzzy called me today and are shipping me a new can to replace this one. They are sending me an oval instead of the round that is in the pictures. I'll post pics when I get it and installed so we can see the difference. Full systems (all brands) are producing close to 10 hp and just slip ons are getting 4-5 hp increase. So I would say that their is something better about the header over stock.
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