This exciting addition to our best-selling rear wing lets you actually tune your rear downforce performance, allowing a high-downforce setup for slow racetracks or slow street use, and a slick, low-downforce configuration for wide-open running on the autobahn or on high-speed road courses. This highly effective, highly functional wing fits all 911s from 65-94; high-quality fiberglass composite construction ensures a perfect fit and easy paint preparation. Mount to your existing deck lid; drilling is required. Professional Installation recommended.