>     ...a very noisy siren in/out of the car, dyes. The last thing a
>     thief wants is everybody looking.
>
> Oh right.  Noisy car alarms are wonderfully successful in
> the USA. (Not!)

I know what you mean. No one takes any notice. I've seen a
doco about how much attention is paid. In one case TV "thieves"
worked on a car in a busy English high street for almost 1/2 hour
with the alarm going. No one challenged them, no one called the
police, and they ended up driving off into the sunset. Hard to
believe I know. But yes, the sun was actually out that day ;-)

And if the alarm keeps going as the car's being driven ? If it can be
driven that is. And there have to be at least 2 x 130dB sound bombs
inside the car. Autodial cellphone is a definite possibility, especially
if some how the car gets on the move. Possibly smoke too. I'm pretty
mechanically-minded, so any modifications won't be too difficult. No
more so than installing an off-the-shelf system

The main object is to get them to bugger off and steal someone
else's. Antagonising them isn't high on the list, in case it makes
them do some damage

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