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Is a old clogged catalysator a planet saver? If the diesel starts to be 10 years old the catalysator is not in the best shape it could be. Mine was just clogged but it could be already broken so that the metal mesh is stopping the gases to go by. This happens usually if you have hit the catalysator to something or it starts be old and badly worn out. So my decision was to take it off.
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