I just recently had an aftermarket alarm/remote starter. Everything functions fine, but that's not my problem. I opened up the hood just to check hoses and fluids and then noticed that the siren was attached to the strut bar. I personally have never seen anyone do that. I was pissed at first, but then i looked for other location they could have put it in and I couldn't find an area. The car is a 2005 Galant GTS V6. I can get pics if that will help, but I'm basically trying to see where other people have theirs installed.

 

Sorry but aftermarket alarm are unpredictable. sometimes a small wind can activate the car alarm or a Harley Davidson biker with a loud muffler can activate the alarm.

What's wrong buying the OEM car alarm? you just have to reinstall it the way it was not like the Aftermarket