Good info. Wish I seen this before my car was stolen 2 summers ago lol!
I will say I think alarms are pointless. I worked at the time in a pretty bad area but thought my car was back far enough to where it wasnt noticable. Well the one day I had to park it outstide the gate was the day it was gone. My car was pretty decked out casue of the rims and how clean it was. Plus I had a ton of local radio coverage and alot of people knew my car, that or I just bumped in the wrong place and they followed me to work, who knows.
About the alarms though. I had 2 totally seperate ones on there. One was pretty basic, code alarm and the other was the viper. The code was the back up alarm. Plus my wires were hidden along with the brain. So it must have been someone very expericened with car alarms. I asked the people by if the heard 2 seperate alarms and the one older guy said he heard just one. So I dont know if my back up ever kicked in. Thanx to my buddy for shitty install on that, lol! I also had shitload of sirens in there as well. Must have been one def son of a *****. Anyway, just my experience and hope never have to go through that again. My perfect way to hide my system is get a car that fits in. I have a cavalier and is pretty normal looking. Once seat is folded up and deck is out, looks stock. Plus I only slam it on the freeway. Never had a problem with it and dont even have an alarm on it. So......... Just saying lol!