A V6 engine, borrowed from the bigger 100 series, edged aside the old 5-cylinder powerplant when Audi restyled its smaller sedan. Replacing the former 80/90 models, the new 90 came only as a 4-door sedan on a wheelbase two inches longer than before. Overall length grew by four inches. Three versions went on sale. The 90 S and 90 CS versions were front-wheel drive, while the 90 CS Quattro Sport got permanently engaged all-wheel drive. Antilock all-disc braking and a driver-side airbag were standard