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.

by in Wisconsin Rapids, WI on September 12, 2009
Get Your Car Fixed at a RepairPal Certified Shop.
We certify shops based on expertise, quality work, and verified customer reviews
1 answer
ANSWER by , October 13, 2009
Hi, Were you able to find out any info about this? Is it related to the upgrade?