Are sure you aren't hearing the AIS pump? It runs when the engine is cold and pumps air through the cats to reduce pollution. It can emit a whirring or whining noise for a short while.
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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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