S&S Cycle Classic Teardrop Air Cleaner Kit 106-4669 Kit specifically for 58mm S&S Cycle Single bore EFI throttle Bodies Efficient and free flowing intake that can add two to five horsepower Uniquely designed back plate has air horn style radiused entryway to reduce turbulence Dimpled cover with directional air cone on inside creates smooth path for air Great addition to performance exhaust or cams