Audi A3-Small Sporty Hatchback (4 Cylinder)
Audi A4-Small Sporty Sedan or Wagon or Convertible (4 or 6)
Audi A6-Midsize luxury sedan or wagon (6 or 8 cylinder)
Audi A8-Large Luxury Sedan (8 or 12 cylinder)
Audi S3-Sport Model of the A3 (not sure about engine)
Audi S4-Sport Model of the A4 sedan (8 cylinder)
Audi RS6-Sport model of the A6 sedan (8 cylinder)
Audi S8-Sport Model of the A8 (10 cylinder)
Audi TT-Very Small Sports Coupe/Convertible (4 or 6)
Audi Q7-Midsize Luxury SUV (not sure about engines yet)
Audi Allroad-Offroad Version of A6 wagon (6 or 8 cylinder)
this is the current lineup. The old lineup is below:
Audi 5000/100/200-Old version of the A6 (5 or 8 cylinder)
Audi 4000/80/90-Old Version of the A4 (4, 5, or 6 cylinder)
Audi Coupe/Quattro-Old rally sports coupe (5 cylinder)
There are oddball Audis here and there but these are the main Audis