SuperFlow 901(?), but I don't remember if Dwayne said the software package has been upgraded since when I was there 10++ years ago.
To get a sense for how "happy" it is or isn't, the old version of this same engine made about 610 HP and pushed my 3750# car & driver to mid 10s at 126 MPH in full street trim. The track is close to sea level, so the #s do reflect that.
If that was through mufflers,the 610 number is probably pretty close...
Yep: 610 HP & 570 torque on the dyno with open headers and my mechanical water pump; full 3" TTI x-pipe system to the rear bumper thru Dynomax Ultraflows, plus ailternator drag... I figured about a 4% loss as installed in the car.
