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Old 02-24-2010, 08:48 AM   #1
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custom make exhaust bypass valve?

There seems to be very mechanical people on this forum, so i would like to ask if anyone has done this.

Is there and can you get a generic vacum/electric bypass valve and splice it inline with the pipes before the muffler?

It may not give any HP increases, but I am sure there is a way that a pressure switch can be rigged to open under open thottle and give a more agressive note to the car.

Just a thought.

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Pedro rear stabilizer bar, CF strut braces, Maxspeed headers with 100 cell cats, Fabspeed cat bypass pipes, H&R springs with M030 setup, TRG rear links, EVO air intake, B&M Short shift kit, Raby IMS upgrade, Raby underdrive pulley
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Old 02-24-2010, 10:35 AM   #2
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Would love to know too - both the valves on my Tequipment have failed so will be looking to replace them
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Old 02-24-2010, 10:40 AM   #3
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I'm sure it can be done, the hard part is finding the components and doing it for less than the Porsche sport exhaust. Use electric "hot rod"cut-outs? Some newer cars ( Mustang? ) have lightly spring loaded flappers in the mufflers that open with increased back-pressure.
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Old 02-24-2010, 11:39 AM   #4
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There was a guy on here that rigged up a butterfly valve exhaust a couple years ago. His name was Bogg or something and he posted a step by step and sound clips. He went to all that work and the general consensus was that it sounded like crap. Try searching "exhaust valve" and I'm sure his thread will pull up.

*edit* Found it.

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Last edited by Adam; 02-24-2010 at 11:44 AM.
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Old 02-24-2010, 12:08 PM   #5
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Sounds like a lawn tractor on steroids.
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Old 02-24-2010, 02:05 PM   #6
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here's another thread

and here's where you can get the needed h/w

I still wave at Boxsters, but they no longer wave back :-(
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