EVE200-112-1 / 200-112-1 - Application Notes 02-04 Avalanche 1500 5.3L 05-06 Avalanche 1500 5.3L w/ elec. fan 02-06 Avalanche 2500 8.1L Vortec 99-04 Silverado 1500 4.3, 4.8, 5.3L 2005 Silverado 1500 4.3, 4.8, 5.3, 6.0L w/ elec. fan 99-04 Silverado HD 1500, 2500, 3500 4.8, 5.3, 6.0, 8.1L 03-05 Silverado SS / Vortec MAX 6.0L 00-06 Suburban 5.3L 00-06 Suburban 2500 6.0, 8.1L 99-06 Tahoe 4.8, 5.3L This system produces up to 21 horsepower over the stock air-box unit! Our exclusive Filter Adapter tremendously improves airflow directly into the intake system. Another feature is our CAD (Cool Air Dam), which helps to isolate hot air away from the filter and provides a denser airflow charge.