Forced induction effectively increases the pressure and density of the air, which in turn allows a much higher percentage of oxygen to be introduced to the air-fuel mixture.

This results in a virtual capacity increase of the engine without an increase in physical size of the engine itself.

The intake pressure may be controlled according to the engine speed, thereby providing extra power at high speed, without wasting fuel at lower speeds.

Each option has strengths and weaknesses, a turbo acts as an obstacle to exhaust gases due to its position in the exhaust system.

Whilst a supercharger uses torque generated from the rotational mass through the crank pulley, a turbo uses the volume and velocity of the exhaust gases to spin the turbine wheel.