This S&S high flow classic teardrop air cleaner kit fits 2008-'17 HD Twin Cam, 103, 110 Tri-Glide and CVO stock-bore throttle by wire models . Efficient, free flowing design can add two to five horsepower. Uniquely designed back plate with air horn style radiused entryway and dimpled cover with directional air cone on inside creates smooth path for air to reduce turbulence. A performance air cleaner is a must to get the most out of performance exhaust, cams, big bore or stroker kits. Kit includes, aircleaner backplate, pleated, washable filter element, chrome plated aluminum teardrop cover, all required hardware, and instructions.