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Knocking in the engine at 5000rpm

(2006 Chevrolet Cobalt SS)
in Wisconsin Rapids, WI on September 12, 2009
My car is knocking when I get it up to 5000rpm. I am wondering why and if any one else is having this problem. It does have a stage 1 upgrade and only 19300 miles.
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Popular Answer
on October 13, 2009
Were you able to find out any info about this? Is it related to the upgrade?
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