If the exhaust is a restriction, yes, that will help. However at these power levels, I believe the stock exhaust should be adequate. I had checked backpressure with a gauge with the stock setup and it was zero, but I can check again for grins. The 3.5L turbo was not designed to operate at 22psi boost nor ~200hp so I still think it's at the edge of its performance envelope with my setup.

Kurt, when you have your 6mm pump built, you may want to ask if they can slightly reduce fueling at low RPM / low boost, and slightly increase fueling (?) near redline. But it really ain't bad as-is. The midrange roll-on power is sweeeeet. I'm afraid the fuel economy will suffer due to the extra layer of lead in my right foot...