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Old 01-05-2013, 12:40 PM   #25
mikefocke
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Join Date: Aug 2005
Location: Sanford NC
Posts: 2,583
Or is the strategy to replace the forward two since the rearmost pair only do some checking of the cleaned up exhaust? Mine got lazy at 60k or so but I only replaced the front ones. I used Bosch who makes em for Porsche and because there would be no doubt they would be the right ones.
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