I ride with some bars that have been extended, not as nicely welded as the pair in the reply above, but I've been riding these for a year - been fine so far.
I trimed them down to about 1" wider than they were originally (s&m slam bars, by the way) got them second hand from a friend - he had cut em about 1" ither side.
I cannot see them snapping off easily, if ever.