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I had the beisan seals, redrilled pump disc and timing chain guide done on mine around 55k I think. Guide was perfect with virtually no wear. Disc and hub tabs also fine with minimal marking to the disc and it also had the later bolts already installed (my07 10/06 production)
The seals made a bit of a difference in response when freshly installed but after a while that improvement subsided. I don’t know if that was related to the seals bedding in or adaptations of some sort, softening things.
At 40k, I’d just leave it. Although mine is now better set for the future I wouldn’t do it again at that mileage knowing what I know now. Unfortunately to get to that opinion you need to have it all apart, at which point you might as well change it all!
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