The Elite series 320 amp HOT RATED alternator offers 200+ amp output at idle RPM, and excellent durability. 6 phase technology, combined with massive twin rectifier assemblies and 12 diodes makes these alternators totally durable for daily use, while still maintaining great output at low RPM. This unit comes with an OEM diameter pulley, making it perfect for high RPM and racing use. NOTE: This unit may require a rectangle to oval adapter harness if your vehicle was equipped with the CS144 Heavy duty charging option from the factory. (this is not common, see thumbnail photo of the standard plug that this alternator comes with) Ask a MechMan associate for assistance if you are unsure!