Airflow and Filtration are the most important requirements of any aftermarket filter. AIRAID® Filter Company has developed one of the coolest direct-replacement, high-flow filters on the market today for the 03-08 Chevrolet/GMC Kodiak/Top Kick C4500 & C5500 6.6L TD & 8.1L Gas. The latest AIRAID Direct Fit, Premium Replacement Filter features steel reinforcement rods and a epoxy coated aluminum filter mesh for structural rigidity. All AIRAID Premium Filters, including the Direct Replacement Filter, features AIRAID's SynthaFlow ® technology that consistently filters down to 2 microns. This prevents harmful dust blow by and potential damage to your engine. AIRAID's Direct-Fit Premium Filter flows substantially more air than the stock air filter. It's also washable, reusable and carries AIRAID's “No Hassle Warranty”. It will be the last air filter you'll ever buy for your vehicle.