Authority Motorsport Full Rear Diffuser 6 Piece Kit V1 specially designed and tested for the Chrysler 300 All Models 2015 to 2021. 6 Piece Kit Including: 2 Rear Side Wings 4 Rear Diffuser Fins Hardware and Installation Instructions Included Our unique Rear Diffuser Kit attaches directly to the stock bumper (drilling is required), adding the functionality and looks of a Rear Diffuser without having to swap the entire rear bumper. Benefits: Increased Downforce. Better stability at high speeds. Improved aggressive look. Installation time is less than 30 minutes. No special tools are needed. No need to remove the rear bumper or diffuser for installation. We only use the best materials, in this case is an Aluminum Compound for added strength and weight saving.