I recently installed an banks big head waste gate, 4" mbrp exhaust, and AFE intake manifold on my 2001 7.3L. When the motor is cold i am hearing as sound almost like the waste gate is open bypassing into the exhaust but only at part throttle rolling through town. When i apply more throttle the sound goes away but then comes back when i even out back to part throttle..... after everything warms up it seems to go away, I checked everything for leaks and didn't find any. Its a woooshing sound hard to explain. Has anyone ever run into this before?