In the 26 to 27 psi range of boost output is 840 horsepower. This is with custom ECU dyno tuning from Precision Tuning.
Precision did not push the turbos as far as they could to preserve the driveline. What would these turbos make when pushed with an upgraded transmission? Good question.
Oh, and how about the pricing? $5995 plus core exchange. That is the best turbo upgrade value in the M157 world right now.
As a reminder, before the turbo upgrade and with bolt ons this E63 ran 10.6 @ 133. That was at 670 all wheel horsepower. What will it do now? We can't wait to find out.