One of the aspects of the C6 A6/S6 that dates it the most is the incandescent lighting inside and outside the vehicle. Ziza fixed this on the interior years ago with their Master Interior LED Kits and now they have LED bumper side markers, just like on newer vehicles. These LED side markers feature a lens design very similar to the factory rough style lens, but contain an amber LED strip on the inside that provides a very crisp, bright accent light when the parking lights or headlights are turned on.
These LED side markers are plug and play and do not require any coding or wiring. They are SAE/DOT approved for use on North American roads.
