It doesn't come out

The serial cable was extended and mounted on a permanent plate under the passenger side dash. I use my laptop and just plug right in.

Also the RCA Input too was mounted in a permanent spot, so I can just plug any external audio source in when I want to.

If you look at the picture where the subwoofer is under the carpet.

Look slightly left and you will see the air vent duct. Now, underneath it you see a little black vinyl piece that was matched to the factory. On the backside of that mount (what you can't see) is the Serial and RCA plugs You can reach around the back and feel them, but you can't see them in plain view.

I have updated the site to show them:

http://www.agonyguild.com/nsx/audio/

If you want direct links try....

http://www.agonyguild.com/nsx/audio/rcaplate.jpg
and
http://www.agonyguild.com/nsx/audio/rcaplate2.jpg

(Yes, I know in the picture the vent was dirty .. but 3 weeks of cutting custom wood and what not creates a lot of saw dust :P... needless to say its clean now).

-B