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      08-28-2014, 02:41 PM   #1
Calichase
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Has anyone installed Exhaust "flapper" valves on their Z4m?

Hello everyone,

I would like to combine my rpi mufflers with a set of catless headers, but I know the set up will be very loud. So i wondered if I could remove a small straight section of my exhaust and replace it with an identical section containing electronically controlled valves that would muffle the sound somewhat. This way I could open them up when I wanted the full performance, say track use, and close them for street driving. Anyone ever research into this?
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      08-28-2014, 03:53 PM   #2
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I'm not an exhaust expert but I'm not sure the flapper would increase performance for the track as it would probably disrupt the exhaust flow through the system. More than likely it would just put you right on the edge of or over the maximum decibel level if that's something that's enforced at your track. I'm sure others will will be able to offer advice.
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      08-28-2014, 05:08 PM   #3
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I wanted to do this but all the exhaust shops around my area (Seattle) said that it was illegal and they would not do it. It might be different in your area. Good luck and keep us posted.

Last edited by Dalecan; 09-03-2014 at 09:57 AM..
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      09-03-2014, 05:01 AM   #4
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Zstig had some. I believe he made some posts about them including this one where he was selling them.
http://www.zpost.com/forums/showthre...hlight=Exhaust
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      09-26-2014, 10:43 PM   #5
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yup. thanks
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