Recirculate the BOV. It's long to explain so search around for more intimate detail but the short version is that you expell metered air out of the system when you don't circulate the BOV. When you lose air that the computer is already adding fuel for, you run pig rich after the BOV vents, and the car runs porrly and will stumble, stutter, and even stall when shifting or getting off throttle in boost.

Myke, don't tell us you just bought the car so you hear the loud BOV sound. Say it ain't so. ;)

Also, leave the stock IC alone until you upgrade your turbo. MBC, 1G BOV (or other recirc. BOV), some sort of fuel management, boost gauge and then reevlauate from there. Good luck man and take care of that maintenance stuff first. Then get after the modding once it's running smoothly.