It never hurts to have an extra layer of protection and it would be highly recommended IMO. I have a Roadster and I have both the factory and an old but very reliable Alpine unit with Radar installed. It does give an extra layer of security and peace of mind. That said, no system is really theft proof nor vandalized proof. It is merely a deterrent. If the object of desire is tempting enough, thieves will do whatever necessary irrelevant of the obstacles.
One thing we need to understand is that while modern factory alarm systems are very effective against theft of the vehicle (unless being towed) as it is designed in conjunction with engine management, it is powerless against theft of ancillary items (wheels, interior items or vandalism). This is because most if not all factory systems do not have tilt, shock or glass sensors to detect intrusion. The reason behind the omission, is the potential maintenance involved since these sensors can cause issue with false alarms. The majority of the public does not understand the limitations therefore manufacturers do not want to deal with headache hence have limited various monitoring sensors to meet with everyday life. Additionally, OEM systems are by designed generic and if thieves are well versed with the system's design, they will easily defeat it given that every Z, Maxima, or GTR will have the same X unit installed in X location.
What a good aftermarket system will do is to enhance the protection IF it is installed correctly. IMO, only two sensors necessary are shock and radar. Again, this must be well adjusted and configured. A good system will only activate when there is a threat and not cause constant "ignore-me or I hate my neighbor piece-of-****" car false alarms. It should not trigger on bird droppings alone. The worst systems are those that cause constant false alarms because it breeds contempt, apathy and ignorance.
Above all, common sense is prevails. Do not invite thieves to break into your car by affixing break in my car stickers - AKA stereo brand name stickers on windows. Park in well lit high traffic areas and turn off your booming stereo a block or two before you park.
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