Any idea of a good alarm for my sprinter?

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Know a few people with there cars being stolen or broken in to and I don't know what I would do if it happened to me so I was just thinking if any of you know of a good alarm and things that can improve my 86 from being stolen... Thanks.. Jake :)

[AE092]

Mongoose M20, better version is the M60 and a kill switch will make life slightly harder for would-be theives

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Yeah I was thinking of putting a kill switch in just unsure of were at this moment guess I'll have a nice look when I get my car back from getting a roady! Just so hard choosing a alarm with every one saying different ones are better and stuff so just want to know what people think/use