How would one go about doing this, because i really like the navigation and i dont want to replace the headunit.

 

I added a profile amp(500watt rms), and a Pioneer Premier 12 inch sub. Its helps the bottom end alot, but it isn't quite right. The sound is incomplete. I am thinking about adding this sound processor.

http://www.crutchfield.com/p_236REQ/...ch=req&tp=6870


I'm just not sure if it will fix the problem.