UPDATE IV: Exhaust Drone - X-pipe flute?. See Post 72 - Page 5 - Rennlist - Porsche Discussion Forums
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MagnaFlow Overland Performance Cat-Back Exhaust System Installation
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FIX EXHAUST DRONE WITH THIS CHEAP EASY MOD!! - YouTube
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Exhaust drone causes, and reduction techniques - Engine & fuel engineering - Eng-Tips
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Finally got rid of the exhaust drone... - MBWorld.org Forums
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How to Fix Exhaust Drone - Cheap AND Easy - YouTube
