Cool thanks for replies again.Sounds like some kind of porsche part faulty or maybe the car being low some owners before the lastest owner has bottomed out over a speed bump or pot hole in road maybe hitting the exhuast or cats. causeing small bend or something over time the heat starts to break it down causeing the nosie to act up. Just a thought,but hopfuly not related to some kind of engine problem that shows.tells that the engine hasnt been cared for over the years which causes the cats to burn up.
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