1989 Audi 100 2.3L 5 Cyl NF VIN: B FI Naturally Aspirated GAS. 1990-1991 Audi 100 2.3L 5 Cyl NF VIN: C FI Naturally Aspirated GAS. Ensure Proper FitTo confirm that this part fits your vehicle, enter your vehicle's Year, Make, Model, Trim and Engine in the Compatibility Table.