What are crooks most likely to rob from your car?

What do you think catches a thief's eye when they walk past your car: your satnav? Your impressive CD collection? The truth is not so flashy, because they are far more likely to have their eye on your catalytic converter. It's part of the car which filters some of the pollutants out of your emissions, which doesn't sound particularly useful in the second hand market.

So why are the thieves after it, and how can you protect yourself.
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