I have a 2006 Chevy Cobalt SS/SC and im changing the headers and midpipe today. The midpipe is 3 inches and narrows down to 2.5 inches to bolt up to the stock cat-back. The bolts on the rear flange of the mid-pipe are completely rusted out and are unsavable. I will have to cut them off. Does anyone know the size and dimensions of the bolts so I can get new ones. I saw somewhere they are a 13 mill bolt but the wrench just spins around it. Need thread size and bolt size please...thanks

 

I have some heavy duty overkill bolts, That I used on my flange, it was like 50 bucks for the 2 bolts and nuts, need a set? 30 shipped.

 

I would jump all over it but I need them now lol...been running on open headers and ready to change the exhaust over....do you know the sizes?

 

I can take a veneer to it when I get home, but off the top of my head I dont know sorry.