After market car alarm/immobiliser

[MD5]

Sorry guys, I never seem to have much luck with the search facility here. I typed in car alarm, and also tried car+alarm, and kept getting this message: "Fatal error: Allowed memory size of 50331648 bytes exhausted (tried to allocate 2097152 bytes) in /home/mbclub/public_html/forums/search.php on line 1012"
so I give up!

I saw a thread here recently about an after market alarm/immobiliser which I'm interested in for my 124 cab.

Any recommendations please?