i have a clk 320, 2000, found one with only 25000 miles on it, amazing car. i am purchasing a performance computer chip for the car, does anyone know the best performance for the money. and also what is the price to get the 6 disc changer for the car...? and is the car already wired for it so i just have to put it in, and also if it is wired can i put in another cd changer.