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What you probably hear is the air pump for the emissions... sounds like a high weeze for about 5 minutes or less. Once the car gets going the pump shuts down. It's what Porsche (and other car companies) use to pass emmissions tests in cold start up.... they pump fresh air into the exhaust to fool the emmission test.
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My Porsche mechanic drives a Saturn.
'98 Artic Silver w/ Tip
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