Basically a simple question... what if any, differences are there with installing a new headunit speakers sub n amps to a tl with nav as opposed to without nav? any different connections, wires, etc? i might be having someone do it who has done it on a non nav tl so im just trying to see if its going to be the same thing for him or a difference ... and where can i get the wires needed to keep steering wheel controls and nav voice with an alpine cda 9856 head unit? thanks guys.

 

i really need to know the answer can anyone help me?

 

For steering wheel controls, check out Crutchfield. I'm not familiar with the navi though.