How much power you running? Anything over 1k-1500 rms and your going to need a bigger alt. If under that replace the stock with what ever from xs that will fit plus like a xs750 or something. If you haven't done so do yourself a favor and run some 0/1 from the alt to the battery, chassis ground, and battery ground. I always use welding cable as it's much cheaper, more flexible, more weather resistant than stereo cable.
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