where to buy exhaust?

My summit kit was pretty easy to install and a very good value imo.
72 Demon 360 727 manual steering and brakes Doug's headers.
Only real issue was the two pipe pieces on each side from the muffler back were mislabelled left and right. Pretty obvious when you try to fit them.
A little trimming here and there but nothing unexpected from a kit made for a 45 year old car.
Sounds pretty good too.