So you changed the look of the front and rear of your B8/B8.5 A4 or S4 but forgot the sides? Upgrade your exterior styling with the ECS Tuning Gloss Black Flat Side Splitters. These side skirts simply bolt on underneath the rocker panel with included self tapping screws and add a more sporty appearance to your vehicle. A great looking stand-alone body part or one that compliments other existing exterior styling upgrades. Designed in-house using state of the art 3D laser scanning and CAD technology for precision fitment, each set is crafted of gloss black, UV stabilized ABS polymer to achieve its world class appearance and provides an aggressive and sporty style that's sure to set your vehicle apart from the rest.Convenient, pre-drilled mounting holes allow you to correctly align and secure the side skirt extensions to the rocker panels. We suggest putting a dab of a rust preventative (anti seize or similar) on the tip of each screw before install. This will lubricate the screw and protect the newly threaded holes.