Its worth doing, esp with that mileage on.
Remove the pipe before the EGR on the left of it, and the ETM on the right and you will see carbon build up. Gets lots of rags, lots of carb cleaner and screw drivers. Its a messy messy job.
Don't get clearer in the ETM, I'm told it affects the delicate cogs inside.
I make it a regular once yearly job now.
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