[Raven18940]

If everything is fine til you give it the boot I'd check for a boost leak.

 

[Raven18940]

I had i loud "Farting sound" from mine now n then, turned out to be the dump valve diaphram had split.

That's a good way to describe the noise I'm getting. I have no trouble holding vacum or boost and it bypasses just fine with a loud psssst, but every once in a while when the turbo needle is at 0 (neither vaccum or boost) I get a loud, resonating fart noise. I don't think this is Jim's problem as it's a recirculating system, unless it's cracked and venting to the atomsphere.