Guys! I need some of your expert advice!

Last Saturday I fitted an ITG CAI, and had a Stage 1+ map on my ’56 plate S3. All seemed fine until last night I was driving…. enthusiastically and it seemed that I momentarily lost boost right at the top of the rev range just before I changed gear it also did it this morning coming into work.

I think it was the DV operating just before the red line which I thought was a bit odd, up through the rev it seems to pull fine and as hard as expected, so I’m not sure if it is the valve that is the problem or not…

Any thoughts?…