What is the inside diameter of the stock exhaust tubing on a 94 z28 right before and right after the cat on the other side of the flange? I need to know so I can buy a length of tubing to make an "ORY."

Thanks.

 

inside diameter is 2.5 if im not mistaken... anyone else here??

 

I believe it to be 2-3/4" at the intermediate pipe.. 3" where it exits the factory Y-pipe to the cat...