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      08-03-2011, 08:08 AM   #1
bmw13's Avatar

Drives: 1M - GIAC:S2
Join Date: Jul 2009
Location: Boca Raton, FL

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Question EXHAUST VALVE LIKE 135i? Golf Tee Mod?

I noticed that the stock 1M exhaust gets extra loud all of a sudden around 2200-2300 RPM. I recall this happening on all N54's and there being a exhaust flap/ valve in which opens around that RPM range. As I did the golf tee mod on my last car I quickly found myself under the car looking... and I found nothing similar to that system. Are all four open? If all four really are open, there has to be a valve somewhere in which his suppressing the sound, if anyone knows the source of this low rpm restriction, please do tell. I strongly feel this will give me that close to stock purr a lot of us are looking for.
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2011 E82 1M #215 of 740

Last edited by bmw13; 08-03-2011 at 08:19 AM.