That's not a GM pipe. It was made by the AP/Merit/Goerlich corporation. They were all the same company and sold in different markets. I sold a lot of their chrome pipes for 69 and later Camaros. I still have one hanging in the rafters, along with some chrome Walker chambered exhaust for Oldsmobiles. One of the parts stores I worked for had them on display. Couldn't stand to see them go in the dumpster.
