well an upgraded alternator is around $600 for 270 amps from nations starter & alternator. The kenwood amp is 900 at 2 ohms. The sub is 4500 peak and 1500 rms. That meaning the amp couldn't keep up for what the sub can take. I don't mind buying a new amp anyways . Also Ron we cant forget the other 2 amps and rest of the speakers. Also that's right 150 amp stock.
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