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So the mileage in the X is just about 73k and from my understanding a lot of the mileage came from the previous owners doing travel on the highways. Most of the mileage I have added since ownership has been highway as well and will continue to be. Another thing is that we take ours up the mountains often which surely adds additional loads.
As for this project, I would consider it a two days project primarily because you'll need to soak the manifold overnight at a minimum. This helps soften the carbon deposits and makes removal far easier. It took me a total of around 2-3 hours just to clean the manifold. Add another 2 hours cleaning the EGR/throttle body and swirl flaps, this alone accounts for a good deal of time. I have not been using a service manual as things are relatively straight forward and removal of the manifold doesn't take much time. All that being said, this could definitely be a weekend project and in my eyes well worth it in the long run.
I've been thinking of picking up another manifold and offering an exchange program so people wouldn't have to deal with the cleaning process but I'm just not sure if the interest is there at the moment.
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