prob wont be even that!!! depends on what make ect...
Yer definatly amp them, no 2 questions, make a huge difference. I havnt installed any of my ice in my car for the simple fact - i dont have the car yet- but ive got the stock pile of amps, mp3 player, comps, soon to have 6.5" subs in rear door, or the new genesis 6x9 subs in the rear (as i cannot afford space in the boot, used to be able to in the Discovery, not now!!!)
So i cant help with how to get wires through, its usually quite hard and you sometimes have to cut the grommet to feed the cables through,
So what have you done with your comps?? dont they have xovers?? if so what did you do??