How good are Factory Lexus Alarms?

[newguy2day]

I recently added a new set of rims to my late model SC, including intake and exhaust.

I got looks before OEM, but now I am receiving uncomfortable looks. (parnoid)

How good is the factory alarm? I heard about dual-alarm setups, but could not find anyone around town to do them.

Really want shock sensors and window sensors.

Should I upgrade or keep factory?

 

[retrodrive]

anything stock is not good since most theves have all the skills to go around any factory system. Get a pager one and let a private installer put it in so a thief would not even know where the brain is.