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  • i know what they are, I am wondering why they are removed in London?

    Because a) they blunt performance (the concept of buying a diesel to go fast is lost on me, however), b) some idiots actually like a huge cloud of soot to shoot out of their exhaust, and c) they clog up and fail (and damage your engine) if you don't get out of town once in a while and give the engine a bit of an Italian tune-up.

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