wow, lots to comprehend, lol. ok, from the top:
i have a mockup picture on my pathetic build thread, with the grille im talking about, its the two square headlight one. i got it from the pick and pull by EM, Mechanic and Whuntmore (and others)
yes, you can use the existing connector to fire your relay(s), and itll all work normal
i doubt you need somethin as huge as 8, even our HID kits use 12 at most. yes, the run is high power, but unlike an amp kit at 17 feet, this is more like 4. and you could add a wire to the solenoid and itd be fine. think of it as running a (cant believe im about to say this i hate these things) cap for you subs. you can use the cap as a distro, and itll be fine. i should get a pic of the one in my honda. two 4 awg running one to each batt, and two 8 awg, one to each amp, for a total of 4 wires on each post lol and im only using it because its a stinger, its chrome and it has lights and a voltage display, and i won it at a convention! (thats my story and im stickin to it, those things are
bandaids)
thinkin out loud is fine, unless its with or about our lady friends, those thought are best left up there. ill draw a diagram tomorrow, its late here.
HIDs arent the devil alot of (no offense anyone) older purist guys make them out to be. yes, they are effin bright, yes they CAN be blue, but not always. and yes, they "should" for DOT be behind a projector. but if you aim them right, no blinfing oncoming traffic. but, the life of a real HID is actualler WAY longer than a standard halogen bulb. and if you get a 4300K kit, they are actually white, not blue. no need to pigeonhole ourselves into the OEM equipment just because it keeps the car "original"