He's speaking of the "Deltagate" feature in the wastegates included with the Star kit. It has a fitting for vacuum, as well as one for boost. In a high load situation, it is possible for the turbo to spin up due to the increased exhaust energy from the load, but to still have a vacuum condition at the manifold. From what i understand, this is bad, so the wastegate compensates by sensing the boosted condition at the turbo and the vacuum condition at the manifold and opening to vent some exhaust energy. The dumptube from Star just drops down about six inches from the manifold and stops.

-DarkOne
I'm so bad, i should be in detention.