The 2021 Audi A6 luxury mid-size sedan gets a mid-year makeover that adds more power, more black trim, and more cowbell. The 2021 Audi A6 can be had with a Sport trim exclusive to the mid-year model, Audi confirmed to The Car Connection on Thursday. The Audi A6 Sport costs $56,445, or $500 more than the base 2021 Premium model, but comes with a...