As long as the speakers are a 4 ohm load you will be fine and most are. The one thing you should look at is the efficiency the higher the db's the louder the speaker will be and the more efficient it will be with the power you give it. But also keep in mind bigger speakers require more power still because of the bigger drivers on the speakers. It is sort of a +/- thing. They will sound better than your factory ones, although not sure with a stock head unit in a z never tried. But still will be better.
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