Race Mufflers is Stainless Headers out of Minnesota. They have good US stainless tubing, Rath-Gibson, and their own mandrel bending machines. I use a lot of there tubing based on the quality and price. Burns also uses Rath-Gibson. It is more expensive from them, but the bend quality is also better. Not knocking on Stainless Headers, but the the bend legs are not 100% perpendicular to the radius. That is the difference in price between the two.

Burns has an excellent program, and if you purchase tubing or a flange from them, they will run it for you for free. It is a quite an involved questionnaire about your engine, so have flow numbers, cam spec's, engine spec's, vehicle spec's, etc, available.