The Password:JDM Dry Carbon Fiber Gurney Flap / Wickerbill is a short lip that protrudes upward from the upper trailing edge of the 06-11 Civic Si 4DR's factory wing. It’s used to enhance the wing’s down-force characteristics by separating the airflow on the back side of the wing, primarily that which comes over the top of the wing. The result creates a localized high-pressure zone on the top side of the wing generating down-force. When used in conjunction with a functional front splitter and canards, you will be able to enhance the overall aerodynamic characteristics of your 06-11 Civic Si 4DR. Care instructions: Please note that these parts are finished in natural dry carbon fiber, which does not include a UV-protectant clear-coat finish. We do not recommend adding a clear coat to our products. We instead recommend applying a coat of Spray-on Wax or Ceramic Coat to prevent water spots / white marks from appearing after rain or car wash. Disclaimer: All Tecnocraft Composites and Password:JDM Dry Carbon/Kevlar products are hand crafted and as unique as a fingerprint, no two items will be exactly identical. Small imperfections such as wavy weaves, small bubbles and resin blemishes will be inevitable, and they do not affect performance. Such minor imperfections are race industry standard and considered acceptable.Additional shipping charges will apply for Canada, Alaska, and Hawaii customers. You will not be billed for shipping at the time of purchase. After we have received your order, a sales representative will contact you with information on the shipping charges. This item usually ships out in 3-5 business days from the original purchase date.