I found this posted on one of the facebook forums. Looks like it's the first production custom subwoofer enclosure I've seen for the MS. I've been wanting to fabricate my own custom box for that little cubby. I know many of us have been longing for deeper bass. I know nothing of this company or the quality of the product, but I just thought I'd point it out. Note that this is just an enclosure and subwoofer. You'd still need to add an amp and somehow hook up to the audio system.
"Pre-installed in the enclosure is our CEA Certified NVX VCW 104. This 10" Dual 4-ohm VCW Series Car Subwoofer has a Power Range (RMS) 600-750 watts wired to a 2 ohm mono load, giving you endless options for amps to power this amazing sub package."
BE-TSLAS-VCW104 B.O.O.S.T. Series Bass Enclosure for Telsa Model S
"Pre-installed in the enclosure is our CEA Certified NVX VCW 104. This 10" Dual 4-ohm VCW Series Car Subwoofer has a Power Range (RMS) 600-750 watts wired to a 2 ohm mono load, giving you endless options for amps to power this amazing sub package."
BE-TSLAS-VCW104 B.O.O.S.T. Series Bass Enclosure for Telsa Model S