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Author Message   Schnitzel Posted on Tuesday, July 12, 2005 - 08:50 pm:        anyone know if there is a difference between the 9 and 12 exhausts, thanx, hans   Metalstorm Posted on Tuesday, July 12, 2005 - 09:27 pm:        12 exhaust can has a butterfly valve. The 9 does not have a valve. The 12 headers are 1.75" The 9 headers are 1.5" That's all I can think of.   Edonis Posted on Tuesday, July 12, 2005 - 09:31 pm:        Indeed. The twelve has a servo activated valve that is controlled by the ECM to improve torque at I believe the midrange. First used by Honda early 90's I believe.   Jedwele Posted on Tuesday, July 12, 2005 - 10:51 pm:        Actually Yahama was using consistantly on some of thier bikes since 1987, I think they were the first to really start using it. Seems like most the other companies just picked it up in the last 5 years or so.   BadS1 Posted on Wednesday, July 13, 2005 - 12:14 am:        Yamaha's System is very different actually.It sucked.Ihad nothing but problems with my 91 FZR 1OOO.   Tunes Posted on Wednesday, July 13, 2005 - 12:33 am:        I believe I read somewhere in here that the 12 exhaust is a little longer than the 9... right?

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