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      02-03-2009, 04:14 PM   #5
john970
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Drives: 08 135
Join Date: Feb 2008
Location: Denver

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It's the exhaust flap, it is used to close one of the tailpipes to comply with idle noise requirements. You'll hear two clanks on a cold engine - one right after startup closing it, and another opening it again when the engine warms up. If it bothers you search for golf tee mod, it is a pretty useless feature.