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My left Muffler Exhaust Valve wasn't closing at idle, when you started the car both sides were open and then the right would close, you could hear the left was louder at idle
after physically testing the exhaust flap and the solenoid valve with an external 12v power source I ordered a replacement from Ebay and some 4mm vacuum hose.
VW part 037 906 283 D, (D is the mounting type)
