I can recommend the Porsche door subs, you will probably find a used pair on eBay. Then fit some rear speakers if you don't have them already. Then fit a LOC from the front speakers to run an amplifier to run the subs in the doors. A decent amplifier can transform the door subs. The Porsche amp really does suck.
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2003 Boxster 2.7L
2010 Civic Type R
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