Quote: 'Ceramic coating warranty voided in the event of an out-of-tune carburetor'...
Wow...
TTI warns you of this when you buy their headers.
I screwed mine up by doing this to mine when they were new, wish I would have tuned my 440 with old headers first. I did not have enough timing when I broke in my cam and fried the coating right by the flanges. My bad and am living with it. I actually burnt a hole/ crack in one of my headers, took it off and welded it back up from the cam break in.
Other than that I don't have anything else to add. Good luck Stu. web page
