seldomseen wrote:These style aftermarket navigation kits offer the best solution for a factory like install. However, it seems as though many of them aren't compatible with the Bose stereo. It may be worth replacing the Bose stereo for the clean look though. Particularly since the Bose stereo in the Altima sound mediocre anyways.

Check out the likes of Crutchfield if you already haven't. Crutchfield has a large selection of DD aftermarket navigation systems.
I have checked Crutchfield but couldnt find what I wanted. I am about happy with stock bose in my altima. so I would just keep this for now.
the reason why I want this is it looks like a factory.
I believe stock bose audio for altima has 1ohm oth on the other hand this aftermarket unit has 4ohm.
in this case if I just put this unit to stock bose, will this drop the performance of audio or fry stock speakers?
or to avoid any risk should I buy something like impedance matching device?
If yes can you recommend for me?