I am of the opinion of "if it isn't broke, don't fix it." You may have an IMS that lasts100K miles, or you may have an new IMS that will break 1 week after you installed it. Who knows. There are probably more folks here who left things alone than those who have been proactive replacing 'good' parts. Don't fret over things that may, could, or might happen. Enjoy and drive your car.
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