My cat had broken up so much, a large piece was at a 45 angle to the rear of the cat and partially blocking the exhaust. Its amazing how different the car feels now in 1st gear, I've got a bit of quattro-shunt, and now with the damaged cat gone its much less pronounced and smoother. Maybe a big part of the 'shunt' when going on and off throttle in 1st was due to the cat blocking the pipe.
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