OK..here's a pretty basic question for you guys. The stock 35 on my truck i got used as a trade for something bigger is now making a medium pitched "howl" if you will at around 10 psi of boost and drops off at 8psi letting off and 12 psi giving it more throttle. Does this mean bad bearing or shaft? i'm curious, it seems to work just fine and snappy as ever, get a little howly at times pre-boost as well, then at 10 psi ...

 

I wonder if you have a boost leak? Maybe a torn boot or loose clamps?

 

Yeah check your boots and clamps first. Mine was doing the same thing right before it blew up on me :'( I hope you have better luck than I did.