The entire objective of an air intake kits system is to give oxygen to your engine, which is required for your car to burn gasoline. More oxygen means more power from your engine, so better airflow is a great way to boost your vehicle's performance. The most efficient intake systems use an airbox that is sized to match the engine and extends the engine's powerband. The intake snorkel (the opening through which intake air enters the system) must be large enough to ensure that the engine has enough air at all times, from idle to full power.