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The Injen SP Aluminum Series short-ram intake for 2018–2021 Subaru WRX STI (H4 2.5L Turbo) replaces the restrictive factory airbox with a tuned 6061-T6 aluminum tube and a fully serviceable SuperNano‑Web dry filter for increased airflow. It installs as a drop-in with no tuning required. Dyno-proven gains are reported and the kit includes a custom heat shield and Injen’s limited lifetime warranty; not CARB exempt.
Injen 18-21 Subaru WRX STI H4 2.5L Turbo SP Aluminum Series Cold Air Intake - Polished
