As craig said... You don't really need Rears. I chose to have some/upgrade because they were lying around at home.

Spend some decent money on some splits and if you have a decent sub it will sound a lot better than the shutter Oem stuff.

You don't need a 600W RMS sub cranked right up that you have to re adjust your mirrors after each song.

Quality not quantity ;-)

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2005 WRX STI