there have been a few posting of people having issues getting remote start installed with IA, search and you'll find them. i don't think i've read a successful one yet. doesn't mean that they don't necessarily work together, just that the dealers can't seem to make them work together.
IA - Intelligent Access, the keyless entry and start system in the Titanium models. Apparently remote starters aren't compatible with this setup, or dealers haven't figured out how to get them to play nicely together? There are no issues installing remote starters in the lower trim lines.