I would try to get one from GM, th LTZ come with the the remote start from GM. I would image the wiring is there and it would be fairly simply for GM to install. I have heard in the forum some where people paid $300-$400 from GM to have a remote start installed. I would stay away from cheap car starters, in the end you will have more problems then they are worth. a good shop will install them for around $300-$400 for the entry level.