I have a 1968 Olds 98 with a 455. The exhaust rotted out just under passenger seat. I need to know the pipe diameter as I need to bend and replace the pipe. And no aftermarket exhaust headers it such are available so I will just repair the old pie with your help guys. Thank you.

 

Are there any good sections you can measure the OD of the pipe?

 

Stock exhaust?

 

The stock pipes from the manifolds to the mufflers are 2.25". Stock tail pipes are 2".