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Old 06-29-2013, 08:18 AM   #17
JFP in PA
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Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,273
Quote:
Originally Posted by smygolf View Post
I see,
So if i want the 4000 rpm function i have to go with Porsches original parts.
They got mail to but i suspect its gonna cost Alot!!

Thanks again Ian, much appreciated!!
No, the OEM system shuts the bypass valves (via vacuum), and prevents them from opening, between speeds of 17 and 29 MPH to meet the Swiss legal sound standards................
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