You want to know if you can install a remote car starter module to your car’s current alarm system. Typically, as long as you don’t have an ignition kill system enabled on the alarm system, you can add a remote starter module from almost any manufacturer. You will need to make sure that the two devices work properly together, but normally as long as your alarm system has a free output channel, it can be done. However, the best way to go about it is to purchase and install a remote start module from the same manufacturer as your car alarm to ensure complete compatibility.
For more info, see Common Problems Associated With Keyless Entry Car Alarms