Search by number: 2000 Audi A4 & A4 Quattro 1.8L Alternator ProAmp 13930 $130.00 each OPTIONS: 90 Amp Valeo Unit ProAmp 13921 $146.00 each OPTIONS: 90 Amp Bosch Unit ProAmp 13931 $164.00 each OPTIONS: 120 Amp Valeo Unit ProAmp 11212 $180.00 each OPTIONS: 120 Amp VALEO Unit ProAmp 13951 $250.00 each OPTIONS: 120 Amp Bosch Unit ProAmpN 13921N $212.00 each OPTIONS: 90 Amp Bosch Unit ProAmpN 13930N $225.00 each OPTIONS: 90 Amp Valeo Unit ProAmpN 13951N $229.00 each OPTIONS: 120 Amp Bosch Unit Why is there more than one unit for my car? Look at the TECH SPECS when more than one unit is shown for your car. AMPS (ELECTRIC CAPACITY): must match you vehicle electric requirements. *** Call us if you are looking to increase your unit capacity! OE ALTERNATOR MANUFACTURER: It is recommended to match the Make of your alternator