WHY Rear Diffuser? - Rear Diffuser decrease the pressure under the car with a resulting increase in downforce. Enhance tires grip and help better handle.Item Information :Fitment：Compatible With 2011-2013 Toyota Corolla Models; Does not include S and XRS model.Color：Unpainted BlackStyle：Oe StyleMaterial：Factory Grade Plastic - Polypropylene (PP)Package Includes：1x Rear Bumper LipInstallation Instructions：Not IncludedNotes: 1.Please carefully check fitment before purchase. 2.Professional installation is highly recommended. Free-Motor strives to win your satisfaction by offering various and excellent auto-part goods, services and replacements. Please feel free to send us a message if you need more information.