I bought this car and it's got 3 aftermarket electronics in it
Some kind of auto ignition system
Clifford Alarm System w/shock sensor
And this crappy sony radio
After a bit of research I found this car has (or had at one point) these audio options.
S676A HIFI LOUDSPEAKER SYSTEM HiFi speaker system
S686A DIVERSITY-FUNCTION AERIAL Antenna-Diversity
S692A CD CHANGER I-BUS PREPARATION Preparation, BMW 6-CD changer I-bus
Here's that radio.

But don't worry, it's garbage, I'm getting rid of it and replacing it with this instead.

After looking around a bit I made some discoveries first this one.

If you look to the left of the amp there's a bundle of wires zip-tied together in a 4-pin molex cable, almost like some kind of amp bypass for two of the speakers, all speakers function properly without it being plugged in, I think the previous owner never ran RCA cables for the subwoofer to the trunk. Also, the signal wire that tells the 2nd amp attached to the independent sub to turn off is spliced out of a wire as well.
The HiFi system, which I assume once was activated by button that looks like this...

has since been removed and replaced by the light for the alarm, seen here.
The antenna is aftermarket as well I assume.

It has the letters Xfi on it.
Then I came across this and I was left wondering what it was.

It's located under the glove box on the passenger side and has all those splices in it, does anyone know what this it or what it goes to?
Any input is great, if any of you know what this stuff is go ahead and let me know. Thanks in advance!