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2001 996 Porsche sports exhaust DIY installation

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Vehicle Information: Year: 2001; Body Type: Coupe; Total Mileage: 7050;

I'm considering installation of the Porsche sports exhaust. I understand the exhaust itself is no special problem, but that the speedometer signal and the vacuum plumbing is tricky to install. First: Is it true that the valve is there only to reduce noise in a narrow speed range, and it isn't needed in the US? Second: Assuming the plumbing is done, is this installation beyond the skills of the typical amateur mechanic? Thanks!

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