The Injen SP cold air intake for 2004–2007 Subaru Impreza WRX/STI uses tuned MR technology and 6061-T6 aluminum tubing to increase airflow safely across the powerband. The kit includes a SuperNano-Web dry filter, optional hydroshield and hardware and is dyno-proven to deliver substantial gains—up to roughly 26 hp and 23 lb-ft. of torque—while producing a more aggressive induction tone and requiring no additional tuning.
Injen 04-07 STi / 06-07 WRX 2.5L Black Cold Air Intake