Only at certian times:

at around 2-3k rpms
at around -5(vacume side) psi boost
slow to moderate acceleration everytime

I did a search. But I cant figure this out. It's a weird-loud air leak type noise. Hard to explain. at 0 psi and above on the autometer gauge, it goes away completely.

All I have is a 6lb lower, intake, boost-bypass, sct tuner, exhaust.

Any help would be great!

 

could be intake, but sounds more like a Throttle body whistle...?

 

mine makes a high pitch whistle when my truck is near 0 on the vac/press gauge