Originally Posted by tccrab

If it were me, I'd go with Marc Haibeck's offering, but that's just me. I've talked to him on many occasions and I trust him to stand behind his stuff. I actually wished I lived closer to him, but that ain't gonna happen.
That being said, here's a partial list of current and former suppliers of headers:

Marc Haibeck
Stainless Works
Doug Rippie Motorsports
Lingenfelter (used to, maybe still does)
Callaway (used to)
Jeal (no longer)
Watsons (no longer)