Useless fact #1: aspiration

A naturally aspirated engine is an engine with no forced airflow to the combustion chamber (no forced induction). This motor has less parts and is less expensive, but produces less power. But if you force air into the combustion chamber (forced induction), that would increase the engines overall power output. You can force induction by either supercharging or turbocharging your engine. Note: engine components might need to be modified to handle the strain from the increased power.