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The clunking noise at low speed over bumpy roads is probably your trail arm not the track arm.
Wheel bearings start making a grinding noise when they fail and the noise will change with speed.
As for the water pump I got over 200,000 miles out of mine but I have seen others have to replace them sooner. I recommend buying a Porsche water pump and not an aftermarket or Laso pump.
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Jäger
300K Mile Club
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