Near the passenger side under the dash there is a spinning/rattling sound. I originally thought it was the blow-off cause it makes the noise everytime I have some boost and let off, but the noise happens sometimes if you drive at a constant rpm or slowly accelerating without boost pressure. Any ideas what it is?

 

are you loosing boost? It might be a boost leak from the turbo couplers. If the sound reallly faint? If so, it might just be the turbos spooling up...

 

I'm getting a boost guage installed Friday, but as far as I can tell it's boosting fine.