Amazon.com: K&N Cold Air Intake Kit: High Performance, Guaranteed to Increase Horsepower: 50-State Legal: Fits 1998-2005 BMW (320Ci, 320i, 325Ci, 325i, 325Ti, 325Xi, 323Ci, 323i, 328Ci, 328i)57I-1000 : Automotive
K&N 57-0015 - 57i Series Generation I Flex Hose Black Cold Air Intake System with Red Filter and Intake Pipe | PTUNING.COM - Performance Auto Parts Warehouse, Installation, and Dyno Tuning
K&N Air filter 57i Induction Kit for 2.8 VR6: WC129KN5700731 | Heritage Parts Centre US
K&N 57S-9500 K&N 57i Series Induction Kits | Summit Racing