Knocking in the engine at 5000rpm on 2006 Chevrolet Cobalt SS

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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1 answer
Hi,
Were you able to find out any info about this? Is it related to the upgrade?