All S&S Stealth air cleaner kits for 2001-up EFI models now come with a special sticker and instructions for applying it to an inconspicuous location on the frame. So, if for some reason a rider does get stopped, there is proof that the S&S Stealth air cleaner is legal.
The S&S Stealth air cleaners feature an air directional stinger cone in the filter, which is said to direct air smoothly into the bore of the carburetor or EFI throttle body for reduced turbulence and increased flow. The air cleaner can be used with the stock H-D Twin Cam 88, 96 or 103 air cleaner cover, or can be used with any of several S&S designed covers. High flow (1in taller) filter kits are also available.