A rare 2017 Audi S6 Prestige, one of 56 sold in the US, is listed with a tuned twin-turbo V8, upgraded chassis and known faults.

A modified 2017 Audi S6 Prestige with a 4.0 V8 engine and extensive tuning is listed for sale with about 79,000 miles, several known faults and a list of upgrades.

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