Search by number: 2001 Audi A4 & A4 Quattro 2.8L Alternator ProAmp 13921 $138.00 each OPTIONS: 90 Amp Bosch Unit ProAmp 13922 $157.00 each OPTIONS: 120 Amp Bosch Unit ProAmp 13933 $204.00 each OPTIONS: 90 Amp Valeo Unit ProAmpN 13922N $166.00 each OPTIONS: 120 Amp Bosch Unit ProAmpN 13921N $232.00 each OPTIONS: 90 Amp Bosch Unit ProAmpN 13933N $277.00 each OPTIONS: 90 Amp Valeo 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