96-00 Honda Civic 2.50" Air Bypass Valve for Cold Air Intakes Red Inlet size: 2.50" (63mm), Red Element. Please refer tot the picture for bypass valve overall size. Virtually eliminates chance of intake system ingesting water if filter becomes submerged Installs along upper portion of cold air intake systems with minor modifications (cutting might be required, depends on application) Vehicle Application: 1996 1997 1998 1999 2000 Honda Civic REMARK: The Air Bypass Valve is NOT for use on forced induction vehicles.