Yes the bypass would solve the issue if it is this, If this doesn't work it could be various other things, look at it possibly being the N75, Jerky boosting.. or a bad Actuator, which would cause your boost to slowly drop off when at full boost, If your thinking it could be the MAF just unplug it and see if it runs worse.. if it does then its not the MAF.. Also as the other lads have said Boost or VAC leak can also be a PCV leak unfortunately it can be many.. im going through a similar situation at the moment and having to rule everything out.. lol
Cheers
