The most cost effective solution is recoding to Hifi, running new wire from radio to trunk and using our amp. You will lose a pair of the rear speakers and center, trust me logic7 is overrated.
Equipment list-
3 way speaker set $800-$1000
Bimmertech amp/dsp $800
Labor and coding-Roughly $600 or DIY.
With this option you can easily add a trunk sub if you want more bass.
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