PF Series Power-Flow Air Polished Intake System (PF2055P) by Injen. HP Gain: +11.1 hp. Torque Gain: +12.3 lbs. x ft.. Includes: X-1021 Filter. The PF Series Air Intake System is made for high performance cars, trucks and SUVs. It features a larger air filter and a larger diameter air intake tube to meet the airflow demands of the large engines in these vehicles.