You can use an aftermarket CD head unit with the built in amp with no issues. You will need an adapter for the antenna as the BMW uses a smaller jack.
I installed an Alpine CD in my 525iT (identical wiring and cassette head unit to your E36) with no issues then went back to a factory BMW CD43 from a Z3 to keep the stock look.
Plug n' play.
Bmw 325i 92 radio wiring?adware
The BMW amplifiers use only the + side of the speaker output. This means you would have to find an amplifier that can use a chassis ground signal. When hooking up a typical aftermarket amp you need to use 2 more wires to complete the -/+ feed from the decks normal speaker output and break it down with resisters to make it a regular signal for the new amps input (rca). Since most amps have 3 or more sets of RCA inputs you will only have one feed from the deck. Then you do this you end up two wires short. This can be cured by adding two speaker wires to the front dash and attaching them to one of the two front speaker sets (not the tweeter). Once you have signal to the amp and have all the wires you need to not have to install new wires to the trunk. However a 200watt amp should be powered my a much larger wire than the stock BMW amp uses. Now once you have all that set up you have to cap the amps output wires to send the right frequency to the right speakers.
If your not into all that just open the dash up and pull the body's door trim up and add some RCA's to and a big fat + and - power wires and a then capp the wires..
Bmw 325i 92 radio wiring?antivirus scan
You need to be more specific. There are 100 different answers for radio wiring. If it is the head unit you want, go to a best buy or circuit city and ask for a wiring harness for the head unit. They will give you a model specific plug that will then have wires that are color corresponding to the ones going from the head unit.
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