Wastegate issues...i think

[cre]

Originally Posted by cre

There should be no sound WHILE you are boosting. If there is the most common causes (as well as causes of the code 34) are: #1 boost leak, #2 bad AFM, #3 shot wastegate and #4 bad turbo.

Sounds most like a boost leak to me... a small one, hence the whistle/groan/woot sound.

I wouldn't run that filter. Gets plenty of poor reviews, a couple show-downs have shown it to perform very poorly and I've seen enough of them collapsed with bits (of just the foam) sucked into the turbo for me to go nowhere near it. But, if you like it that's fine.