By fuel adjustment device attachment to the actuator upgrade kit can provide more power at higher supercharging range.

Can have the optimum fuel control at higher supercharging pressure

With only actuator upgrade kit causes dilution of fuel at higher supercharging range and bring down the power.
With the power assist kit, you can have more power with optimum fuel setting at higher supercharging range by the exclusive development of fuel adjustment device "PAC/Power Assist Controller" (some vehicles excludes)