KA24DE Swirl Control Valve (AKA Intake Butterflies) Delete Kit. Compatible with NA or Turbocharged applications. Increases maximum airflow through intake runners and removes potential leak points from old vacuum components. Comes with all hardware for mounting the blockoff plate as well as an O-Ring equipped panhead screw for sealing the stock set screw hole. Feel free to message with any questions about the product or install procedures. Leave a message in the comments if you want the version with or without the S13 240sx hatchback engraved. If no comment, the hatch engraved version will be chosen.