Coating is a cosmetic thing.
If you want headers that fit your car well and do not leak,then go TTI.
TTi's website does state if you run the headers on a fresh motor for break in they will get discolored.
Had them on a 73 Duster with 360 but motor had some mileson it and no discoloration.
Tip: Use Percy's reusable header gaskets they do WORK!!

Last edited by 68Cbarge; 01/18/19 06:27 PM.

'68 Newport Custom Barge on a Budget!! BOAB
1973 Satellite WAGON! 318- 3 on the tree!!
2008 Chrysler 300c HEMI!