Guys... Horsepower is calculated. HP = torque * RPM/5252 (which is why hp and torque always equal each other at 5252 RPM). Many times with smaller turbos to max out a system it's common to make as much torque as is possible in the midrange then it drops off as RPM climb due to the motor not breathing as well or the turbos running out of air.
On this setup we get torque up to the level we desired, then held it as long as we wanted to. This will result in a HP numbers higher than torque numbers. No magic. Just look at the curves. Nice, flat torque shelf. No torque mountain and then the ride is over. The impression when in the car is that it never stops pulling to redline.
If you wanted to spike the boost in the midrange we'd see much higher torque numbers than we have.
A lot of these things can be manipulated for drivability, longevity, track conditions, etc. It becomes a more viable option when so much horsepower is on the table vs. say stock turbos on pump gas, where you make as much power as you can wherever you can to make the car move.
Chris