I'm selling my wife's car (an E90 sedan) since she can't steer clear of other cars and various wildlife.

I built a custom FG box which houses and Ascendant Audio Arsenal 12 and a Sundown Audio SAE-1000D. The setup sounded pretty good although I lacked fold down seats. The setup has 30 days of play time on it.

I'm including just about everything you'll need for the install to include:

Box w/ sub and amp mounted
Kinetik Audio HC600 battery (better than a cap) w/mount in spare tire well
Wiring, fuse holder, and crimp rings
Line converter

All you need to do is tap the signal in the OEM amp harness, run the wiring, install the HC600. Then use a self tap screw to secure the box.

Literally, all you'll need are some scotchlock connectors if you decide to not solder the connections to the OEM harness.

Retails for $950 for the sub, amp, HC600, and wiring.
Asking $750 for everything shipped within the US. Paypal is bigjae1976@hotmail.com