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I would avoid sony at all costs...with either their head units, speakers, amps or subs. They're just not as good as their previous models. i would go with Re Audio subs as a previous person posted. Those pioneers you listed are usually good for when you have a limited amount of space, but you're not going to get much bump with that line of pioneer subs.
As far as power wiring thickness, I think you can get away with just 4ga wiring as you said, you're only looking for some bump and not go crazy with the bass. The cost of the wiring for the amp and sub also is determined by how many amps your factory alternator puts out. Usually one these import cars, the alternator is rather tinny. My corolla only has a 70a alt and I tend to get lights dimming when I crank up the volume and I've got 1ga power wiring, bigger battery.
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Totaled 1996 Corolla DX
2009 Nissan Altima 2.5S with Takeda SRI, stock dual exhausts, mesh grille
LED bulbs for dome/map/turn signal/tail light/3rd brake light/back up bulbs
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