XXX55,

FYI...JL Audio is currently working on a custom sub enclosure project that will fit in the OEM location (same location as the DSP sub would go) - See a few threads down in this section. So, all you need to do is add an amp to power that sub.

Anytime you add a sub, it is almost certain that you'll discovered new sqeaks and rattles unless you have done your homework ahead of time and dampen out everything that you can think of...this can get expensive and time consuming. Afterall, you are installing a subwoofer that is suppose to VIBRATE the heck out of everything.