Ive got a 79 z28, When i took the motor out and had it re-built, I didnt put the heat riser or dampener back on, so i just have the piece that attaches to the exhaust manifold and the pipe. The muffler shop told me that i could buy an aftermarket piece that goes there that i can put in the the original one's place (i want to replace it because it makes noise when its running, that and i dont know if its causing my motor to over heat when its hot outside and some of the exhaust cant get out.) But i was just wondering if anyone knew a company or somewhere i can find this after market piece.

 

Like this: 2" spacer
Or: 2.5" spacer
You can save some money though if you take yours off, remove the butterfly, and fill the butterfly shaft holes on either side by pounding in a tight fitting bolt or small steel rod.