I am wondering if its possible to add an OEM nav system to a 2004 Civic. It would seem to fit, but I wanted to be sure it can be hooked up and all that properly. If not what all would be needed. Honda pretty much used the same system from like 1999 to about 2010 to my knowledge. Any help would be appreciated. I am not concerned with labor costs at all because I have someone that will put the unit in for me for free and hook it up.

Here is the car I am buying

2004 Used Honda Civic 4dr Sedan EX Automatic at Fayetteville Autopark, IID 13502847

And here is the Nav unit
http://www.ebay.com/itm/2008-2009-HONDA-CIVIC-RADIO-CD-NAVIGATION-SYSTEM-39540-SNA-A110-TESTED-E21-006-/291413024516?fits=Make%3AHonda%7CModel%3ACivic&hash=item43d991df04&vxp=mtr
or possibly this one
http://www.ebay.com/itm/2000-2011-HONDA-CIVIC-SI-OEM-NAVIGATION-SYSTEM-EASY-TO-INSTALL-KIT-ORIGINAL-/231511158375?hash=item35e723ee67&vxp=mtr

 

As long as you're getting the GPS antenna, making an adapter harness, and purchasing a double DIN head unit adapter... you may get it to work. However, it may ruin your keyless entry functionality.