The STi has a nice trick up its sleeve with the DCCD...
The little thumb wheel adjusts the torque & you see the current setting displayed between the fuel & temp gauges...here's a borrowed explanation - I'm being lazy...
"The driver makes adjustments to torque distribution in the manual mode via the console-mounted control wheel or entrusts distribution decisions to the DCCD control module through the automatic mode, the ratio of front/rear torque distribution can vary from 35 percent front/65 percent rear to 50 percent front/50 percent rear.
In automatic mode, DCCD varies torque according to input indicating acceleration, deceleration, cornering force and wheel slippage. In manual mode, the driver selects from six stages of center-differential lock-up. The more lock-up, the greater the torque directed to the front wheels – up to the 50 percent front/50 percent rear ratio. Mechanical limited-slip front and rear differentials enhance the system’s effectiveness"