i love my teg. more info on mine in the link down in my sig..
the hardest part aboput installing my system was running wire threw the door boot's, like mentioned before there is a molex plug in the door boot that clips to another plug in the door.
i ran stinger 4 wire ( about the size of 10ga power wire) threw my door's, it was a ***** but well worth it.
have not had any problems with my teg except for a bad catalatic converter, and im at 140k. still runs great.
i had 2 12'' fi ssd subs and a cross fire vr2000d in the hatch, took up all of the cargo area, but i pulled it all out and put one 10'' sub in, still get's pretty loud.
i allso upgraded my alt, under hood batt, and am running a rear batt as well.
i have no headlight dimming what so ever.
all in all, it's been a great car.