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what have you got?

You can always run an ASP overdrive pulley for your alternator, and be way ahead on HP.

I have 2 power acoustik 12" with a Phoenix Gold 600watt class-D amp.

When i really turn up the bass, the headlights do dim a tad...but the volt guage doens't budge?! I have never seen that guage move at all since I've owned the car. What gives?? I hardly ever listen to music with the bass up that much so it should be okay for now.