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Foreign Object Debris ?
yeah I watched a documentary about jet fighters... ^^
Can be a loose heat shield on the exhaust or underneath the trunk area.
The water pump would make noise all the time.
Ben
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ASE certified Automotive Master Technician.
Porsche Tech in France.
www.benautodesign.fr
Ben-Auto-Design : Performance parts for 9X6 / 9X7
1982 928 S Euro
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