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      03-14-2013, 12:17 PM   #24
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Drives: 2014 991 TTS Cab / 2013 F12 M6
Join Date: Jan 2013
Location: Marietta, GA

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Well that puts a decisive end to that!

Just making sure this is read correctly...To clarify (and correct me if I am wrong) the exhaust valves being wired open has no side effects other than louder note (slightly). That was my experience. There si no hissing or humming whatsoever. Now having modified OEM without valves and different piping it sounds fantastic.
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