Get the 4 ohm sub if you aren't driving it with a custom sub amp.

Its the same sub really, just 4 ohm vs 2 ohm.

This setup basically deletes the rear speakers in the car. You will not miss them.

4 channels on the amp. 2 channels to the front components, 2 channels to the sub.

You can always add a dedicated sub amp later and then add some small rear speakers for fill.

The factory rear speaker are about an inch in diameter. They are truly a joke, and yours are probably dry rotted by now.

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2001 Alpine / Schwartz Coupe
2001 Estoril / Estoril Coupe
2001 Steel Grey / Estoril Coupe
1999 Estoril / Estoril Coupe

Sunroofs are for girls.