so u wanna do what i have.
I have a clifford DEI alarm so i added this extra stuff and already save my car.

DEI/clifford WIRELESS IMMOBILIZER KIT <-- goes to the fuel pump and is wireless.
also i have the DEI siren with backup battery buildin so even if u cut the wires the siren still goes crazy, only way to shut it off is with the key and if they dont cut the cable then u use the control to disable it. (so i have 2 siren)
I also have the hood lock just to make it harder
also with the alarm i have the buildin battery backup so even if u disconnect the car battery the alarm works wonderful, i already tested and was showing off lol one great thing about this buildin battery, is that ur clock or radio doesnt need to be reset to input the code if u disconnect the car battery .
and visible security i have a multilock with buildin cutoff switch ( if u cut the multilock there still is a hidden cable going to the ignition cable) btw my ignition cable is not under where normaly is . and of course i have a club just n case anyone wants my airbag.

when i get a new car n the future i will just trasnfer all this stuff to the new car