I think you didn't read the thread through. His stock alternator is working properly, it is just getting overwhelmed at times by his stereo system. He was looking for a higher output than stock unit from someone who specializes in alternator upgrades, not looking at getting a parts store replacement.
I'm sure Napa's alternators are fine, but that is not the issue here. All Napa would give him is a rebuilt stock one with the same output.
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