Yes, he did. Went venting his BOV to the atmosphere aka, not routing it back to the intake pipe on the turbo, he was dumping air back into the atmosphere. Which is fine if you have the GM Maf or a Map sensor that is before the BOV. But how our MAS is before the turbo,it calculates all the air going into the turbo and calculates how much fuel to dump. When dumping the BOV to the atmosphere, the ECU already calculates for fuel including the air the BOV dumps, so you will run pig rich and possibly can cause stalling.
So pretty much just recirculate the BOV back to the intake and you will be ok. In both pictures I posted the cars are both venting to the atmosphere.
Heres a stock MAF which has a recirculated BOV:
http://www.dsmtuners.com/gallery/fil...DSC_0016-1.JPG