not too much of one anyway...... well i have thi 1995 saturn (july)which is a model 2 (is there a model 3, what time frame was it produced?) and when i open up the system, there is all sorts of secuitry on the top part of the case with wires that go to the bottom part of the cae, making it dificult, from what i can see, to remoe the case and put a board in it. is this totally normal and i am just being dumb? because in all the instructions there is not steps to get the top case off and removing wires, or is that just common knowledge? thank you very much.