Search by number: 2018 Chevrolet Impala 3.6L 6 Cyl Alternator ProAmp 11453 $139.00 each OPTIONS: 150 Amps SC6 ProAmpN 11453N $342.00 each OPTIONS: 150 Amps SC6 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