[reborn73]

What should I do with them? Paint? Leave?

I want OEM status of the exhaust manifolds, so what is next?

 

[bad8nti]

If you want OEM, research what was done on your particular model and go accordingly. On Graveyard Carz, I have seen Mark paint quite a few of them on the engine.

 

[challengerfan56]

Maybe clear coat them so they keep the OEM look without rusting?

 

[mrhemihead]

I have tried VHT high temp, sold at speed shops in spray cans. Rust returned in about 2 years.
Ceramic coating will last a lot longer. This color is close to the blasted look.

http://www.cerakotehightemp.com/finishes/C-105HQ/titanium/

 

[dodge man2]

I've used a barbeque grill paint, maybe made by Rustoleum. It has a finish that is close to bare manifolds. It only last a few years before they will start to rust around the edges though. I think Eastwood might make some paint for them also.

I believe 100% correct is they were painted as part of the engine, usually light coverage compared to the engine, and they it burns off rather quickly and then they rust.