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If the whistling happens on a cold start it is the secondary air injection pump, SAI. It is a pollution control device that is on for a short period as the car warms up.
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2004 Boxster S Silver - FUNTOY
2002 Boxster Base Guardsy Red - FUNBOX
1987 Caterham Super 7 1700 Supersprint
2009 Mercedes Benz CLK 350 convertible
1941 Dodge Luxury Liner Coupe
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