I now have a 2003 Honda Accord Ex, and the EX comes with the regular Heat/AC system, but the EX-L has the Dual-zone automatic climate control, and the upgraded EX-L comes with Satellite-Linked Navigation System. Would it be possible to remove the old indash system, and replace it with the EX-L model, so I can have climate control, or both, the Navigation System? They are the same size and everything, but do not know if it would be as simple as plug in and play. Thanks