I just ordered a set of ceramic coated D450's from Autozone. The discount code is CMSAVE25. I tried it to see if it works on the raw steel version, and it does! That's $585 shipped for the raw steel ones, if someone wants them that way. I just went on and ponied up for the ceramic coated ones since I don't have time to fool with hauling them to Calico Coatings to get them done. I would imagine the code works on any style Dougs Header set you would want.