mystery whoosh noise

[Djdawson2 at aol.com]

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Brett,
This noise... occuring when accelerating only??  Are you building any/much
boost??  If you're not building much boost, and the noise only occurs during
acceleration, I'd take a good look at the bypass valve, and the vacuum line
to it.  You probably already have, but worth a check.  You can also try
clamping off the line to the wastegate, and then check your power/boost.  If
you get normal power and boost with that line clamped, you'll need to check
the sensors that regulate the WGFV... check the codes if you can.
HTH,
Dave