The mtx or LOC are devices that you run your speaker outputs of your stock unit to and make low level outputs to run to new amps to than run new speakers off of giving you a lot more power. 300 I would say would be a no go for labor, LOC, amp, and speakers looking more like 500. Trust me when I say this, if you put new speakers into your Z and power them off your stock base head unit, your going to lose a lot of not only volume but quality because they will only be getting around 9 watts as aposed to 25+ they recommend. The more power you feed a set of speakers the better they will sound.
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