Was wondering how powerful the stock alternator is in regards to amperage?? What would be a suitable alternator replacement? I have looked on the Jc Whitney homepage and they have 60-80-100 amp alternators there which I have shown interest in ... In regards to the stock alternator, which would be the best alternator for my 6 running a serious sound system in the car... 80 or 100 amp ? ?would they fit ??