Just another short addition, someone finally took a MazdaSpeed6 to the track -- it ran a 13.7 on their first trip. Surely with enough practice and with some better drivers (the driver is, admittedly, not the best drag racer) the times will get even lower.
In addition numerous buyers are getting their MS6s dyno'd. They're all getting about 225/270 at the wheels (the MS6 is obviously severely under-rated in torque). Even the guy who previously had problems getting a full dyno run previously got a full set of perfect runs and hasn't been having any additional problems.