E Series Billet 250A racing alt - Fits 6/12 CS144 - MachinedE Series Newly redesigned for 2015, The Elite series offers the highest possible amperage and durability available in a large case alternator. 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 engine idle speeds. This unit comes equipped with an OEM diameter pulley, making it perfect for high RPM and racing use.