The ECU needs to be unlocked physically but once this is done you can flash tunes through the provided OBD-II cable.
The power gains for Stage I and II on pump gas are very respectable. Notice torque for the Stage II tops 400 lb-ft at the wheels. Also, Stage II offers a nice top end gain from 5500 to 6500 rpm over the Stage I:
Power gains are part of the picture but the software also offers throttle overrun, startup roar, and increased power level sport gauges.
Stage I starts at $995. Stage II runs $1095. The OBD-II Hex flash cable is included along with free map revisions and map switching between stock and tuned.