I had the same problem for 6th months before figuring out the problem. I too had a ripped turbo inlet, PITA to replace by the way. I ended up having a weak coil pack. Only sputter at WOT under boost and it would cut out like a fuel cut or something. I had NO CEL ever. Turns out I had a bad ignition coil! I didn't know which one so I just replaced one, drove it still was cutting out, then swapped it with the next one and bam! It was fixed! My problem started about six months ago after hauling ass going on the freeway, then it started cutting out. I'm almost positive it is a bad coil!