Instructions:
1) Locate solid brown wire from main tree branch off the brain.
2) connect main siren (red) to it and ground (black) to a seperate chassis area.
3)Tap piezo(if dei=red) 12v into main siren (red) and seperately ground piezo(if dei, black).
*Suggestion: relocate the piezo from under the hood to into your cockpit. this in return will equal a loud, highpitch screetching inside your car, which will deter and annoy most thieves.
*The Obvious: alarms will deter theft but if someone knows what they are doing they'll get your ride. I suggest buying a battery back up, couple more piezos, some relays, and go all out on hiding your brain, and bat backup. ie: behind gauge cluster, etc. use loom and 3m to help hide it. if u do it, do'em right. 99.9% of stereo shops put them in acessible areas.
Completion: after completing this you'll have a pain in the ass car to break into which won't be invincible, but maybe it'll buy u time to catch them and whoop some ass..