[Shane@DBPerformance]

Food for thought:

A turbo can only flow so much air. When you hit that limit the boost will drop as you go up in RPMs.

Boost is a measure of restriction. You make things flow better and you make more power with less boost, because there is less restriction.

Sometimes trying to force more boost up top results in less power or a lot more knock due to excessive back pressure in the exhaust housing from overrunning the turbo like crazy. One of the jobs of the WG flapper is to open when exhaust back pressure gets too high.