Description Performance air filter replacement for our popular X34 Intake Systems. This high-flow, double-layered cotton filter features a 3.5in inlet, and is a direct replacement for the 034Motorsport X34 Carbon Fiber Cold Air Intake (CAI) System for Audi B5 S4/RS4 and Audi C5 A6 2.7T applications. Features: Double-Layered Cotton Traps Particles as Small as 5 Microns Superior Filtration Over Factory Paper Filter Increases Induction Turbocharger Sounds What’s Included: 034Motorsport Performance 3.5″ Cone Air Filter Worm Drive Hose Clamp