>
> For example if you made a smoke generator by squirting fluid on the
> hot exhaust


Brake fluid injected into the exhaust system, after the cat converter,
will make an unbelievable amount of smoke.

I like the delayed action carjacking preventer, but be aware, a
frustrated thief is likely to take it out on your car.  But having him
be a good distance from you is a good thing.

My car runs APRS, so it's easy to tell where it is, and there is an
"emergency" mode that can be triggered.
http://www.findu.com/cgi-bin/find.cgi?KC6ETE-9

Just remember, anything you install, is likely to go off on YOU by
mistake, so don't get too nasty.   I have been known to install 30-50
watt sirens under the back seat, pointing forward through a thin scrim
that hides them effectively without muffling the sound.   Rated at
130dB @ 10' IIRC  Definitely discourages you from hanging around
inside the car.
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