I know that this is an old thread, but I just finished performing this modification on my 2016 Genesis Ultimate 3.8. A giant shout out to kocyk123 for getting it all started. Just a couple quick notes, at least in my car, the pink wire on the white plug next to the larger gauge red wire, is indeed the ACC power on that I used for the Kicker 400 watt amp (exact same model as in the original post) remote-on signal. I did notice in the wiring diagram, that the gray and black wire is actually the negative going to the sub, and the blue and orange is the positive going to the sub. That's how I hooked mine up so that it would match polarity with the other speakers. I am not an audiophile by any stretch, but I think the polarity is matched because otherwise it would destructively interfere with the bass coming from the other speakers and make the main subwoofer sound more directional and muddy, being 180 degrees out of phase. My hookup blends in very nicely. Again, hats off to kocyk123, because just as he said, you want to turn the gain and the Boost way down, (also I crossed mine over at about 100 to 120 hertz, estimated), and use the base control on my head unit at about +5 or +6. This seems to be where I find the richest and most appropriate balance. Such a Night and Day difference! Had a great deal of fun doing it, but I would absolutely recommend to do as others have, and use a soldering iron for all of your connections, and then tape them up. I did mount my amp close to the battery with an inline fuse so that it had the minimum amount of run. This required the speaker wires to be a little bit longer but those aren't carrying nearly as many amps. I did not want to drill holes into my trunk, so I actually used zip ties and two-sided tape to hold it in place and so far it is not moving. We'll have to see how it does over the next few weeks and months. But the sound system now is living up to its full potential, and I just can't believe how different it sounds. Thanks to everyone who have added to this thread. It made the work so much easier. Oh, finally I will mention that I used probably 25 tie wraps or zip ties to keep my wires running along the existing conduits. It keeps everything out of the way, makes it look clean although everything is covered, and will keep the wires from rattling around. You could probably get by with 10 zip ties, but I have a grocery bag full of them from Amazon so I didn't scrimp.
