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K&N 57i Series induction kit for Audi A4 1.8i Turbo (1995-on) replaces the restrictive factory airbox with a vehicle-specific intake and a large washable, reusable K&N filter to increase airflow across the RPM range. The kit includes adapters and durable components for long service life, and the filter can exceed 100,000 miles between cleanings. Note: 57i systems are not legal for use in California and states adopting its emissions standards.
K&N 95+ Audi A4 1.8i T Performance Intake Kit
