Header coatings, how necessary?

DartOS,

The OP quoted $150 for a coating he wasn't sure he wanted. If he coats them inside and out then the price more than doubles (See RRR post). I am not saying that the OP shouldn't get his headers coated, I'm simply explaining why they rust and what conditions are conducive to coating longevity. I don't think your post was funny...factual maybe but not funny.
You are absolutely correct, coating the inside and outside helps tremendously but it also cost twice as much as the OP had quoted. The OP seems to be looking for the best bang for his buck. I think he's seen some good posts to help him make the decision.

PS- I even tried SS headers, over time they turned a funny blue/black color and they leaked at the exhaust ports that's why I run 340 driver's side cast iron and 360 Mag Truck passenger.

The OP will have to decide how much to spend to get the results he wants. Or how much not to spend, I hope we gave enough info for him to make a decision.

Treblig (no "n" in Treblig)