almost all double dins and single din radios are sililar in size. Not all, but most. If you have the 2010 stock radio, you will need to buy the aftermarket d.din and then buy the mounting kit along with radio bezel to incorperate and fit the double din. Metra makes a kit, as does Schoche. both can be searched on ebay along with the year of your titan.
Theres plennnttyyyyy of other posts about this if you search it in the search bar ontop.
good luck with purchase and install.