i have a 1996 ford escort lx 4 door, and i am thinking about up gradeing my stereo system. i was just wondering what whould be the biggest size of speakers i could put in the door and in the back/trunk. i also want to put an cd/mp3 player in it, and i would also like to know if my car could run all of that without me having to buy another amp or anything like that. also i have 2 6x9 legacy speakers for the back, but im not sure if they will fit. if you know anything about this please help me out thanks!