I finally picked up a head unit. I opted for the cheaper unit from eBay, but Octa-core processor, 4GB ram, 64GB storage, Android 11 and the bigger monitor. It was about $269 with all the cables and e53 mounting kit. It's pretty nice so far. I have it connected and mounted but not screwed in yet since i want to run my sub. So here are my questions:

1) The connector that went to my business CD player. Do I need to do anything with that connector?

2) I have an old RF Punch 300 I'm going to power the sub with. Where are you guys mounting your amp? I'd like it to be out of sight but there's not much room in the spare tire area. And I keep that left cubby full of travel essentials.

3) That little ibus adapter mentioned before, is that solely for the steering wheel controls? Or nav as well? Does it connect to the USB plug on my HU or the Key1 and Key2 wires?

4) And what is the small Can-Bus box that came with my new HU for?

Sorry for the crappy pics it was dark and only took some while I powered everything to make sure it works as intended (it does!)

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2000 e39 M5 Titanium on Black
2006 e53 M54 Titanium on Black
2007 e83 Black on Black Sport pkg
2004 Avalanche 2500 lifted 4.88 gears
1994 jacked up Jeep
1987 GMC lifted short bed on tons