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Old 07-11-2013, 08:43 PM   #2
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Join Date: Jul 2010
Location: California
Posts: 1,815
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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