Has anyone coated their 4.0/4.6 exhaust manifolds with ceramic coating?
If so, did it make the catalytic converters too hot?
A member here previously posted wrapping his exhaust manifolds in gold heat tape, which reduced under hood temps...but made the cats glow(that heat has to go somewhere).
I'de hate to have them ceramic coated and have the same result. Powder coat or paint will burn off.
I'm also not building a show truck, just trying to eliminate as much rust as possible.
Anyone have any success with any product or procedure to coat or cover them?
I assume gutted converters cause a check engine light, possible rough running, exhaust stink, and bad sound from hollow cat shells.
Thanks

 

Not if you put a spacer on the O2 sensor. you'll eliminate the CEL and rough running.
If you install these, you take away the hollow sound and at a glance, will pass a visual inspection.
Nothing you can do about the smell though.

Disclaimer -Modifying a catalytic convertor is illegal in just about every state. This is not a piece of advice, just telling you what you could do.

 

I used this stuff.

https://www.eastwood.com/factory-gra...oaAuNCEALw_wcB

I also dipped them to de-rust and they will not stop rust, but it'll look better anyway.

 

I've never had good luck with high temperature paint on exhaust manifolds.
I don't really care what they look like either. I just hate reaching in the engine bay and getting covered in rust.
I'll have to check on ceramic coating prices locally, and do more digging on possible temperature increases through the exhaust.
Thanks

 

Maybe just have them blasted?

 

After being bead blasted, then they are just raw cast iron, and begin rusting immediately. So they need something that doesn't burn off. Which is ceramic, which has me researching if it's going to insulate too well, in turn sending the heat now not radiating off the manifolds, into the pipes, and possibly too much heat through the cats.

 

 

The paint won't insulate, it'll just burn off.
Ceramic coat Does insulate, does not burn off, and is baked on and applied the same as powder coat.