I've upgraded to an aftermarket amp with aftermarket speakers and headunit...but my dash is kinda ugly with that aftermarkert head dash kit...now if I ever upgrade to the Factory navi system will I be able to hook that up to my navi unit?? soundsl like I might have to get an adapter or something

 

I think what you might consider is call Rockford Fosgate 3Sixty ver. .1 and .2
You get control of the unit using a Palm Pilot via Bluetooth. This unit
lets you use your factory deck, with aftermarket amp,
I know they had a demo car with the rockford 3 sixty unit on a Lancer GTS using the factory Nav unit.

http://www.caraudiomag.com/testrepor...sor/index.html


The cheaper way would be to have a amp with high level inputs.

or some Signal adaptors that adjust the signal to RCA level. They are fairly cheap
and you can find them for $10 to$20