I have bought a very neglected 4.2 V8 as a donor car for mine. It has security stickers on the windows, but nothing obvious about whether there is actually an alarm system fitted.

SO. Questions
where are the components normally fitted?
Can they be retrofitted into an earlier car (just out of curiosity). eg, is the wiring an add in loom, or was it integral as standard?

85 WR quattro
90 V8 Silver, 91 V8 Black, 93 V8 Lago
93 100e quattro V6. Titan, i think