i was sure how to install car alarm until i actually tried, and it is not too bad, you will begin take apart from driver side door entry, then driver kick panel, and up to driver side under dash console, and for steering wheel column cover, insert key in ignition, turn to on, but not start, and turn the steering wheel 90 degree, and you see a screw behind the steering wheel, and do the same for the other side. to remove the steering wheel column cover.
most of the wires are at the ignition switch, some at driver kick panel, steering wheel column
my opinion is, oem alarm sucks, very short operating distant, not many features, no shock sensor, like if some one rear ended your parked car, the alarm probably wont' go off until the door or the trunk lid is open.
the OEM alarm is probably RS3000, very easy to remove because it is plug and play, no wire to cut, the only thing you need to cut is probably the zipties if there is any.
i bought this one on ebay,
http://cgi.ebay.com/SCYTEK-GALAXY-5...ryZ48611QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
notice there is a best offer, he counter offered me at $61 shipped.
here is the installtion manual
http://www.scytek.net/manuals/galaxy/g5000RS.pdf
i have no affiliate with any link above, i am just the end user who bought the product and use it
i've also looked at the expensive VIPER 5901 $270 two way remote, but i feel that remote is very fragile, can't afford $80 remote replacement if it breaks.
a few tricky thing about remote start, most units now offer tach RPM monitor and tachless start, scytek default is tach RPM monitoring, but will need to train the tach RPM once to have it working properly.
i am not trying to argue which brand of remote start is better, but all i need is something that works relibably, i found the one i installed is pretty responsive, and to my satisfaction.
if you really want to install, do plan ahead, have two or three 12V relays with pigtails on hand, ebay sells them cheaper, zipties, electrical tapes, they do come in handy.
and run the wire to your trunk with relays, get yourself a 15LB solenoid to pull the trunk release cable to make it power trunk.
as long as you are not color blind, know the positve and negative voltage, have patient to read, can be done, and you will be happy with your accomplishment.