Description: With ram air. Without zr1, 1990-96. With zr1, 1990-95. All models. 5.7L, 1996-97 with performance pkg. Helps trap airborne particles before they enter the engine Excellent filter capacity and efficiency Allows airflow restriction to the engine for performance Equipped with tight seals to keep unfiltered air from entering the combustion chamber This GM Genuine part is designed, engineered and tested to rigorous standards, and are backed by General Motors