I want to add it into a Gs4 with the nak system.
I heard the digital FM modulators are very clean.
anyone have any ideas?

I am thinking about add the Neo Mp3 car player with the 60 gig HD.
thanks.

the only other option is to GUT out the head unit and the AMP.

 

well if it's anything like adding an fm modulated cd changer you would first have to tap into your stock headunits antenna wire, connect it onto the rf unit, and find a spot to put the controller. the unit also has ground, power, acces. (remote) wires that must be hooked up.