As I receive them I am trying to post dyno runs. Here is one from my initial run (04 XB12S) in Dec '04 at Stone Mountain HD/B. They use a Superflow Dyno which is very conservative. The torque and horsepower curves are very straight.

Here is Tom K.'s run on a XB12Ss on a DynoJet dyno (not as conservative as a Superflow). Much better numbers and the curves look great too. His max numbers were 89.34 HP and 79.05 Tq.