Yes apparently the original factory amp was there behind the cd/radio/cassette unit.
The Stinger brand ISFM2351 blue tooth unit is in now, only visible clue is microphone up near rear vision mirror & button next to dash switches, not entirely happy with it so far, the App to adjust and learn about it has pretty bad reviews and tends to lack consistent blue tooth connection.
Also hard/confusing as to how to tell it to make calls on the run which was the whole idea of a hands free unit.
Streams music ok though.