the cost of retrofitting LED taillights for an Audi A6 can vary based on several factors, including the type and brand of the LED taillights, labor costs in your location, and the complexity of the installation. Here are some general guidelines:

1. Aftermarket LED Taillights Cost: The price for a set of aftermarket LED taillights can range from $200 to $500 or more, depending on the brand and design.
2. Labor Costs: Installation costs can vary significantly based on the expertise of the technician and local labor rates. Installation charges could be in the range of $100 to $300 or more.
3. Total Cost: Therefore, the total cost of retrofitting LED taillights for an Audi A6 might range from $300 to $800 or more. Keep in mind that these are rough estimates, and actual costs can vary.

To get the most accurate and up-to-date information, I recommend contacting local automotive customization shops, Audi dealerships, or online retailers that specialize in aftermarket car parts. They can provide you with specific quotes based on your preferences and location. Prices may have changed since my last update, so it’s essential to check the latest information.