Lets play a game! Just happened two days ago heading into work. I get feedback in my throttle and there is a noticeable boost loss. No CEL's, and from what I could all the couplers on my fmic are seated. It doesn't do it if there is low throttle input easing in the rpm range. Happens only under high throttle input. http://s59.photobucket.com/user/snwb...a6cf2.mp4.html
Exhaust leak possibly. I hear fluttering in your exhaust. If you're losing boost and it's an exhaust leak, it's likely pre-turbo. Uppipe or headers.