Phase 1 included fully amplifying his aftermarket Alpine door speakers and adding a custom Digital Designs single 8" DD308 woofer in an OEM-style custom built box. That provided much better boom....but not enough. The goal with that built was to retain the OEM look.
Phase 2 included removing the first custom box and building a better one with dual DD308 woofers.....and still attempting to retain as much OEM storage as possible.
Phase 3 was a complete rebuild. This is where I originally want to be the first time, but i'm glad he finally came around to this. Fully rebuilt custom woofer box to hold two 10" Arc Audio XDi subwoofers powered by the Arc Audio KSMini 500 watt amp.
This provided a TON more bass.