#1 - Remove the factory or your aftermarket head unit. I had an aftermarket Panasonic HU. I already had RCA's running to the amps so all I had to do is hook up the power and remote wires.

#2 I didn't hook up the display dimming function or the cell phone mute bue everything else works very well.

#3 - I have a bit of alternator noise I'll have to look into it further I don't hear it at louder volumes so its not the biggest concern.

#4 - The empeg Mk2a is a great match for my amps. (Soundstream Reference 604 (Front/Rear Fill) and Soundstream Reference 1000 for subs
Coustic XM-3e Electronic crossover.

Speaker setup as follows:

2 - Kicker Resolution R4c 4" (Front)
2 - JL Audio 1" Tweeters (Front)
2 - Kenwood Excelon 6.5" (Rear) (I don't like these that much and I'm looking for replacements)
2 - Kaption Audio SPL 12" DVC (Now these are amazing)

Sorry the picture is a bit dark I'll post something better later.