Many have seen boost creep with the ATP internal wastegated turbos. I will say going with the vband setup over the ATP specific bolt in exhaust housing casting looks like it will flow better. We've compared the inlets of the exhaust housing for the bolt in and Vband models and the inlet is visibly larger than the bolt in.
The turbo and Vband downpipe might be worth a shot but there are better TIP pipes out there now, CP-E and COBB, and your ECU will not like the MAF housing ATP ships. CP-E does have a flash for use with larger MAF housings but I don't know the specifics of what size the ATP housing is or exactly what size the CP-E flash is designed to work with. I do know it's designed to work with their larger XcelXL intake.
So maybe the turbo and downpipe but I'd source the rest of the kit components elsewhere.