Hey everybody I just joined this form to ask a few questions about my Monte Carlo, and everybody on this forum seems to be quite knowledgeable about this topic. So anyways, what is the extra port on factory stereo? I'm talking about the littler port on the left. It might be a stupid question, but i'm just a beginner haha! Thanks in advance!

 

I cant see the image, but are you reffering to a aux cord port?