Connections to the stock system are pretty easy. Only 5 wires. The rest to the power and sub enclosure are simple enough.

I cant comment on mounting the amp in your car as mine had no CD changer or NAV. There is probably enough room to mount it where the bluetooth ULF normally sits. The ULF is pretty small so could be relocated easily.

The amp has adjustment screws for the bass volume, bass boost and cutover frequency. Pretty easy to setup. I picked up the sub off the rear door speakers. If I listen to an album thats got an excess of bass I can use the fader to turn down the rear doors and subs together.

The sub made a hige difference. I would recommend at least the BSW mids as well.

Chris