I was wondering what the other pully does. I know that one is for the alternator but i dunno what the other one is for. I wanted to get an AEM Tru-Pully and i was wondering if if would fit on the B16 block. AEM said that they have 2 kinds of Tru-Pullys, 1 is for alternator and 1 is for power steering, and the other is for alternator and water pump. I'm putting this in my 98 Civic Hatchback CX.