Hi,
I had done something similar and I love the sound now... It is not the most performance sound but I can get the low frequencies and I can feel it in my stomach...lol
What I did is the following:
- 1 MBQuart RLP254 10" subwoofer that is made for sealed enclosures and requires only 2.95" in depth. I followed some of the posts but is very simple to explain. Took the original box out, dismount the original speakers then I cut the front cover all around to the same level then I cut a piece of 3/4" MDF to match the shape of the front of the box. Used some epoxy to seal it also some hot glue on the outside and filled the imperfections. Cut the hole for the speaker in the mdf, mount the speaker and run new wires to the left side by amps.
-1 AMP Alpine MRV-M500 installed on a small piece of MDF cut to fit instead of the OE CD changer ( I use the DICE Mediabridge instead of CD changer). The amp has Hi-Level inputs and I just got that of the original DSP/amp connector.
Everything else is intact and I'm ok with it cause I have the NAV with DSP
I don't have any pics but I may take some if someone interested.