Thats a nice car, anyways if you got the stock chargepipe maybe other things that can be must be related to boost since you said on map 0 its fine, it might sound like its coming from anywhere in the engine but try to find exactly what side and you will probably be able to tell which side it is because that would help a lot too! you saying you can only hear it while coasting might be that there is less sound from other parts letting you hear it so it might still be present when you are on the gas.
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