I've heard other members ask this type of question, and almost always the answer turns out to be "is it worth buying them now and coating them or, a few years down the road they crack again and having to fork out the money for another pair of headers?"
If you own a Ferrari you'd be don't the car wrong by not getting what's best for it. Would heat shields work? Yes. But wouldn't you feel 100% better knowing there coated?
Good point, I agree with your logic. BUT, given that these manifolds are made with thicker steel than Ferrari OEM, isn't that a reason to not have to worry about cracking anymore? There is also a lifetime warranty on them... I am now shifting my concern to the radiant heat affecting the engine bay, (and cats) as opposed to the heat damaging the manifolds themselves.
The reason I am so interested in this question is:
1. My car has already been off the road for almost a month....and it will likely be 3 weeks more before I can drive the car again....and I just bought it 3.5 months ago. Coating will probably add another couple of weeks with shipping and labor time.
2. After shelling out big bucks for a few trips to Ferrari, I am temporarily beyond my budget...and this would certainly add more time and money to this excruciating wait to get her back on the road again.
So here is another question:
Would coating the manifolds just channel more heat down to the cats, and all of a sudden, now I have blown or fried cats, adding more repairs in a short time? I figured that it would, but I am still learning about my car.
I am assuming next it will be the cats, then valve guides....I just hope I get some time with the car before disaster happens again, which has been the case so far.
By the time I get the new manifolds in, I will be 17k into repairs, and have had the car.....such a short time.