THIS WHEEL IS FOR THE HOLSET H2E
Holset turbos use two different style nuts holding the wheel on.
If it is a 6 point nut, then tighten to 133 in/lbs.
If it is a 12 point nut, then tighten to 124 in/lbs.
It is a left hand thread (reverse thread), meaning you turn the nut to the right to loosen.
Dyno results from an F550 with stock injectors and an H2E.