S8 I guess will have HID headlights so going to LED will not bee that simple and also not that much improvement over good working HIDs. Bulbs do get weaker with age so replacing bulbs with a new pair of Philips X-treme Vision or Osram Night Breaker can bring decent improvement. Another thing is that reflectors burn out with time for HID lights so they are not shiny anymore and does not reflect light as they should. Audi does not offer any projector units on their own but there are number of generic aftermarket units. I suppose you could use LED for the additional full beam bulb.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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