I used DEI's 5x10 piece. Does remote start and security from your factory key fob. It does limit your remote start range to the same range as your factory key; however, I managed to combat this by adding DEI's smart start app to my smart phone. That would allow you to remote start from any distance as well as receive security notifications if your alarm goes off. They make a t-harness for it too for easier install and you can add all the different security modules, i.e. tilt sensor, proximity sensor, glass break sensor, and auxiliary battery.
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