canbus alarm

Hi!, I research about if my CX-5 GT 2014 has factory alarm installed, and I make a test leaving an open window, close the doors with the keyless fob and what surprise, nothing happen!, so I google about and It is seems that USA model doesn't have a factory alarm. I want to install an alarm...

I would like to upgrade to an actual alarm, and not just an immobilizer/central lock. I really do not want to carry two fobs (but will if it's the only option), and found this online. http://www.xpresskit.com/product.aspx?productid=26 they also have one with clifford and viper brand stamp...