Audi A6 C4

Audi's mid-size car was previously named the Audi 100 (or Audi 5000 in the United States), and was released in three successive generations (Audi C1, Audi C2 and Audi C3).[2] In 1994, the latest generation (C4) of the Audi 100 was facelifted and re-badged as the Audi A6, to fit in with Audi's new alphanumeric nomenclature (as the full-size A8 had just been introduced). The exterior was changed only slightly from the "C4" Audi 100 – new front and rear lights, new radiator grille, similarly with chassis and engine and transmission choices.

This is the face lifted Audi 100 and re-badged as A6. Once the A6 was introduced, no Audi 100 were released.

Information provided by: http://en.wikipedia.org/wiki/Audi_A6#C4