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The K&N 57i induction kit for Audi A4 1.8L (2000–2004) replaces the restrictive factory airbox with a large washable, reusable high‑flow filter and vehicle‑specific adapters. Designed to improve airflow across the rpm range while extending service intervals up to 100,000 miles between cleanings, this kit includes the necessary adapters and carries K&N’s lifetime limited warranty.
K&N Audi A4 1.8L Turbo 150BHP Performance Intake Kit
