Hey all, does anyone know about adding a standalone shock sensor into an existing factory alarm. Any good brands? The shops I talked to only has a single-stage shock sensor for 69 installed, integrated with the stock altima alarm. Any suggestions on what I should do? The stock alarm already has hood, trunk, door sensors, and a computerized chip immobilizing system so you can't start the car without a real key with the chip in it.

69 sounds like a damn good deal. just make sure they mount it properly (in the center of the car towards the middle, NOT just in the drivers side firewall area), and they set it properly or let you know how to adjust it. otherwise, youre going to be very annoying when everythig within 3 feet of the vehical sets the alarm off.