HKS Super Mega Flow Reloaded Kit for Nissan Silvia SR20DET S13/S14/S15 HKS intake kit for S13/S14/S15 SR20DET motor, Super Mega Flow also known as SMF. HKS Super Mega Flow air intake systems produce smoother and more even airflow with increased velocity for optimal air/fuel atomization, which result in increased throttle response, horsepower, torque and fuel efficiency.