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Ok, I did a search and the stock alternator in the WRX is rated at 75 amps (at least that is my understanding). Once I get a WRX, I plan on transferring my 500W system into it. I have a 1-farad cap that I would hook up as well. I would guess that the stock alternator wouldn't be able to last for very long (I listen to my music pretty loud quite often). I am mainly wondering about more powerful alternators. Anyone have suggestions as to where I should look or opinions on this? Thanks.
 

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Take your stock alt. to a good electrical shop and they can boost up the amps for you, thats what i did with mine.
 
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