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Hello. Oracle is on the right track I think. Your rattle sounds like something is loose. Should be simple to locate. Go under the vehicle and check the exhaust by banging it with the palm of your fist. If it's not there just check everything else under there by giving a good shake. Sometimes its helpful to have someone rock the vehicle a little while another is underneath, just don't crush yourself.

On the timing belt. Most manufacturers recommend replacement at 60K miles. The water pump should be replaced with the timing belt only if the water pump runs off of the timing belt. Which, in most cases it does. If you do not replace the water pump the bearings could go out, requiring a mechanic to go to the same place again and do the same procedure and charge you $ again. This is the rational anyway.

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