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I did have the same m490 package. My rears were also run off of the headunit. I bought a 996 cabrio 6x40w amp and ran the rear speakers up to the amp instead..then sourced the correct pins for the amp to connect them. Then botched connecting them. Then paid a pro to fix it
End result….sounds about that same as when I ran it off the headunit. I won’t bother with it.
The biggest change was the Sony headunit I put in with 5v preamp outputs, modern processing, wireless CarPlay, etc. I would focus on the headunit and dash speakers for now.
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2001 Boxster S | Triple Black | Stock 17s | Bilstein PSS9s | BAD Shifter | 6x40w Cabrio Amp | 986.2 muffler
"Sixty percent of the time, it works every time!"
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