The factory airbox restricts maximum airflow to keep induction noise down. Upgrading your induction hardware allows the K20C1 engine to breathe freely, dramatically improving turbo spool, sharpening throttle response, and amplifying the addictive VTEC Turbo 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. Eliminate narrow bottlenecks by installing smooth silicone induction pipes & hoses for unrestricted, high-velocity airflow directly into the turbocharger.