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Old 07-09-2006, 01:21 AM   #1
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Default Does it exist??

I don't know or remember where I heard this, but.

Is there a type of muffer, that is hush hush quiet at idle speeds, etc, but when the throttle is wide open, (more vaccumn) the muffler opens up nicly to let a nice purr? I think that type of muffler would be vaccumn modulated, meaning when vaccumn pressure is high, the muffler opens up, to allow more airflow, and a nice deep sound. However, when the throttle or vaccumn demand is not there, (light accelleration and idle) the exhaust is hush hush quiet?

If so, is there such a setup avalible for our cars?
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Old 07-09-2006, 03:36 AM   #2
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there is something that can switch your exause from going through the cat and muffler to going through a strait pipe (at the switch of a button )
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Old 07-09-2006, 04:06 AM   #3
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The system you mention is on Porshe Carrrera GT'*, BMW X3'* and the Cadillac XLR_V'*. It is intake vacuum actuated with an electric selenoid that powers a flap in the muffler.It'* pretty cutting edge technology and I have never heard of an aftermarket muffler with this system though.

The system Peter mentions is and electric cutout system that bypasses the exhaust completley
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Old 07-09-2006, 10:37 PM   #4
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Trucks! the tv show on Spike had just the device you're looking for on it about a year and a half ago. They were not cheap back then, I looked them up and they were like $350 each

Unfortunately I can't recall who made them or what they were called, and my googles have been unsuccessful.
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Old 07-10-2006, 11:04 AM   #5
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I remember a muffler meant for performance that was throaty idling..but quiet in the higher rpm'*.. I think it was Hush Thrush..made by thrush
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Old 07-10-2006, 05:45 PM   #6
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i love the cutouts...goes from passing immissions/inspection to Open Headers

i have heard what you are talking about but dont know nothing about who makes 'em and what not....
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Old 07-10-2006, 07:43 PM   #7
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Never heard of them... Cool idea though. You could do an electric cutout with a hobbs switch for the same effect.
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Old 07-10-2006, 08:31 PM   #8
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I think the 3000GT VR4 had something like this. But it was more than just the muffler. It was tied to the computer somehow. I'll ask my Brother when I get home.
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Old 07-12-2006, 12:02 AM   #9
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Does the Flowmaster Delta series to a similar thing? Gets loud at high power but fairly quiet otherwise?
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