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.