hey- sorry about your lights.... as far as I know the GP comes with a factory alram. Here is the trick... when you buy an alram system you need to get the gm bypass and if you have the anti-theft key most likely you will need an extra. (key stays with unit) I actually have the Viper system that has fm 2 way paging ... works great has all the options... cost was arround 750. Professional install. If you are not looking for something that high-tec... go to your local besy buy or something. Just remember do you pay much attention to other people's car alarms when you are out in public???