Rasing the compression ratio (adding more boost) is what increases both torque as it increases the BMEP (pressure) on the pistons. larger diameter pistons give larger torque for the same BMEP. This is ignoring anything to do with electronics, or cam-timing (dynamic CR)

Power = Toque x Velocity(angular). If you keep the same torque throughout the rev range you will get a straight line for the power. and so if you raise the revs but keep the torque the same (not normally possible) the you'll have more power. likewise if you keep the revs the same, but increase the torque, you'll have more power.

JAmes.