DSP Rear Subwoofer/Audio deck plug-n-play upgrade
So the upgrade to the M5 audio deck is quite popular and this is a comparable if not better alternative. Had 2 JL AUDIO C5 5.25 WOOFERS replace the OEMs in the rear audio deck for $300 from the reputable Audio Sound Design off Highway 7 and Main Street (Invoice attached).
You can remove your DSP deck and plug this in for a significant upgrade over your OEM/aged speakers. Reasons for selling: Car sold, funds will go towards winters for my new car!
Price: $200 [Deck alone is $150 off ebay not to mention you get sweet JLs]