Injen SP Series Cold Air Intake - Wrinkle Black for BMW E82, E88, E90, E92 with N55 EngineThe Injen SP series intake system features MR technology. +9 hp +11 lbs. ft. torque Dry filter element reduces build up on maf sensor Lifetime warranty through Injen T 6061 Billet aluminum Made in the U. S. A Air filter service at recommended intervals lets an engine breathe properly while protecting it from costly damage. Air filters should be inspected and replaced as needed at least once a year, more often if the vehicle is driven in heavily