In the images above the Race version is on the right. The “Race” front splitter is made from ¼” Aluminum Composite Material (ACM). ACM is used for its high quality smooth finish, lower thermal expansion, and superior rigidity compared to ABS Plastic. The major difference between the Street and Race version, is the Race version has an integrated diffuser to help smooth the air as it transitions under the car for increased downforce. The splitter has a vertical trim piece that lowers the splitter 3” with a 4.5" lip to help reduce the amount of air going under the car and the splitter mounts with special rivet style nuts. The splitter also comes with holes for support rods (rods not included).