double din install

I have the basic 2.7l with a non navitgation system...im trying to buy a double din radio. Is the only difference just buying a a bracket or what exactly do i need to do to be able to install a double din monitor??. As always i appreciate any information you give me.

Hi, I am trying to install a Pioneer AVH-P4100 DVD 7" LCD into my 2008 Dodge Charger and wanted to know will the 2007 navigation bezel fit into my 2008 Charger or will the bezel from the 2008 navigation bezel be enough space for this radio? Also can you recommend a good cold air intake...