A performance air intake system modifies the way an engine breathes, replacing the restrictive factory air box and filter with components designed for increased airflow. This can lead to marginal power gains, typically in the range of 5-20 horsepower, depending on the engine and other modifications. For example, a naturally aspirated engine might experience a small but measurable improvement in horsepower and torque, particularly at higher RPMs, due to the less restrictive flow of air into the combustion chamber.
Enhanced airflow can contribute to improved throttle response and potentially slight fuel efficiency gains, though these are often negligible. The perceived performance enhancement can sometimes be greater than the actual horsepower increase. Historically, modifying intake systems has been a popular modification amongst automotive enthusiasts seeking even incremental performance improvements. While the horsepower increases are often modest, the combined effect with other performance upgrades can be more substantial.
