Our air-intake ducts are precision vacuum-thermo-formed to exacting specifications of race-rested designs to yield the lowest drag and the highest air flow velocity, unlike most other commercially available ducts. These ducts are formed from high-impact 1/8″ ABS or Lexan sheets and have extra-wide flanges to accommodate a wide variety of mounting needs. Our ducts have special hose-retention ribs to ensure air hose retention in high-vibration stress areas. Specially designed hose adapter adapts any duct from 3″ to 2 1/2″ or 2″ hose and it just snaps into place. All ducts come in black ABS except AD-D104 which is a clear Lexan NACA duct, and AD-D102 which comes in black ABS or Clear Lexan.