Gs Dreams

how ya'll doing
is it a probelm to upgrade your system to an aftermarket system if you have the lexus navigation system? because i notice that the heat/ac controls are intergrated with the whole set up. so when you up grade ur system would it be a problem to buy the heat/ac controls and installing them in urself? another question, i was looking at the iva c 901 (alpine flip out) and i notice a lot of people puttin monitors inplace and puttin a head unit right underneath, is that a better route to go then the classic flip out? i thought a flip out would be better because it's everthing u need in one but i like how the monitor fills up the whole consoule