I shipped out my stock exhuast piping to a guy in Iowa and along the way the box ripped and the pipe that went over the axle dissappeared. First off whats that called? 2nd is there a part number for the stock cat back piping. The guy made a claim w/ UPS and they are calling me asking me it is that was lost. Thanks in advance

 

Maybe this will help.
http://www.97ta.com/pn23.html

 

It's just called and exhaust pipe in the GM cataloging. Some call it an intermediate pipe. PT# is 10279024