Quote:
Originally Posted by Amessforone
Correction: Valvetronic refers to BMW's variable valve control. A diverter valve and a blow off valve is the exact same thing. Some are made to vent to atmosphere (which is doubtful) and others are set to recirculation (most likely our case)
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I believe the ones that recirculate are called Diverter valves. I had a plastic one on my 1.8T A4 B6. I'm thinking of changing the one on my 2 to something with more noise like a Blow off valve, which is the one that releases into the atmosphere.