AFE 51-12172-C Carbon Fiber Cold Air Intake System (w/Pro DRY S Filter) for 11-24 300 / Challenger / Charger 6.4L 392. The system delivers dyno-proven performance gains of up to 21 horsepower and 27 lbs-ft of torque. With a measured airflow of 600 CFM at 7" H2O, it outperforms the factory intake by 9%, providing enhanced engine efficiency and improved throttle response.