The factory airboxes restrict maximum airflow to keep induction noise down. Upgrading your induction hardware allows the BYH, CND, CNDA, BUJ, CTY, or CMP engines to breathe freely, improving throttle response and amplifying the glorious naturally aspirated intake roar. Ditch the restrictive factory setup with high-volume Induction Kits to maximise your cold air feed, or choose drop-in high-flow Panel Filters for a highly effective OEM+ upgrade.