Wow looks awesome. I am thinking about keeping my stock HU as well and getting an amp to help pump out some more power. How did you hook up your amp into your stock HU? Sorry I'm a noobie at this. Did you splice into your front/rear speaker wires, run them to your amp and run them back?
All I got when I searched was people hooking up amps+subwoofers to their factory HU which I know is just tapping into the speaker wire. I can't figure out how to actually amplify my stock HU or speakers? with an amp.