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Hey guys I have a 06 a4 2.0t I'm working on and it has a p0299 code for underboost. When I got the car I had to replace the turbo right off the bat. I knew that when I bought it but I've had an underboost code still coming up. It does lack some boost but the weird part is that I can hear what sounds like a air leak on the passenger side of the car from inside while driving. I speculate the diverter valve because if I was to make jabs at the throttle it would make a whip like sound. Like the diverter valve is opening and closing. I don't know much about these or how the diverter valve is supposed to work. But is it possible that it's opening and putting air back into the intake while I'm trying to build boost? It's the updated valve too...
 
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