When I bought my S4 cabriolet the headlights were like candles, I looked for a long time for a method of refurbishing the reflective surface but in the end I replaced the projectors with bi-xenon units from a Lexus RX350 within the original headlight body. Cost less than 25 % of the cost of new headlights form a dealer and a much better light output, whilst maintaining a legal beam pattern and all of the OEM self levelling features.
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