factory alarm wasn't removed...

[sw20matt]

I had a alarm installed a while ago and to my surprise when I manually locked the car and touches via alarm the factory alarm went off. it took a min but I figured it out. my question is should they have taken it out, our if I take it out will it hurt anything?

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[economatic]

First off, what year do you have?

My guess is that whoever installed it got a module to interface with the CAN-BUS system, allowing you to effectively double up the alarms. It is actually easier that way (and better) since only one wire was cut and a couple others spliced but your aftermarket alarm has full information about what doors were triggered and lock/unlock functionality. Further, if your car has a factory immobilizer that is also in use (that is good). In short, they likely did the job correctly.