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      10-25-2007, 01:35 PM   #1
Jay Slay
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Helping a friend - Exhaust Bypass Valve

I own a 335 E92..he has a Z4M and needs help finding electronic exaust bypass valve. Does this exsist? Or am I on a wild goose chase.
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      10-25-2007, 02:42 PM   #2
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looking for something like this?

http://store.summitracing.com/partde...5&autoview=sku
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      10-25-2007, 06:21 PM   #3
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perfect..thanks so much!
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      10-27-2007, 01:09 PM   #4
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Bear in mind that he will LOSE power by bypassing the exhaust. You can only increase flow a little bit without the DME panicking into safe mode and retarding the engine. So far I have not found any software that will fool the DME.
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      10-29-2007, 04:33 PM   #5
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I dont see why this would be a problem if you install these post cat/rear o2 sensor.

so it could be like a free flow cat back.
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      10-31-2007, 01:07 AM   #6
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Quote:
Originally Posted by pbdm4k View Post
I dont see why this would be a problem if you install these post cat/rear o2 sensor.

so it could be like a free flow cat back.
-Because the O2 sensors on BMWs also measure impulse speed. If the exhaust is flowing too much faster than expected, the DME starts turning down power. It is VERY irritating! Simulators could be a solution, but I haven't researched them enough to make any recommendations.
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