There was a company called Viper that made headers for Chevy sixes, I don't know if they are still in business or not because I did a quick search and didn't come up with any website for them. They specialized in headers for domestic sixes and many import 4's and 6's. I used to buy their headers back in the 70's and 80's, and they built a first class product in regular steel or stainless.
Bob
