I had a rattling cat on my td6 03 so decided to De cat it.Only two nuts and five rubber hangers and the complete exhaust is on the floor.I carefully ground open the welds on the cat and once open the centre just fell out. welded the seams back together and refitted to car. The cat is not part of the annual test and a free flowing exhaust can only be an advantage. There is no real noticable increase in noise but im sure i can hear the turbo whistling a bit more. I will be checking mpg over the next few weeks to see if there is any difference.
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