New stereo intstall, Sunbird

[Bronigs]

I have a 91 Sunbird. I bought a new sony stereo and decided to try installing it myself. I'm alittle confused, the factory stereo is connected to a metal box, (and so is the casette deck, which is a separate piece). Im not sure if im supposed to connect the new stereo into this box though the wires connected to it or connect it to the wires and eliminate the box. Im not sure, im lost, this car is difficult.

[Bronigs]

alright i figured most of it out by myself. I just wanted to know if im able to disconnect the whole metal box or does it control other things besides the radio.

[Bronigs]

I figured it out, theres a standard GM plug (its on the right side of the main radio module box, and the plug is blue in colour) just match up the colours and it works perfect.