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I would never run speakers that are use crossovers from the stock head unit, amps are cheap enough now a days ~$250 for a good 4 channel + $40 for installation kit, that you should never run off the stock unit (maybe if your an SI w/ factory amplification, but still not the best choice). You will never get the full performance that the speakers are capable of. If you are going to keep the stock unit, got Coaxials. You get better performance then stock and your budget won't be hurting.
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