What to do??? Any suggestions???

If I could go back in time (like before I put the engine in the car) I would have Leanna powder coat them for me. Now that it's assembled, there's no way I'm taking it apart again.
Anyway, short of that, I have been using Bar-B-Q black spray paint on the factory exhaust manifolds of my 90 Power Ram truck since it was new, and to this day there is no rust on them. They look the same today as they did 200,000 miles ago. It will need to be reapplied about once every 2 years, which (until recently) was about 40,000 miles.
When the truck was new the manifolds were black from the factory so I just kept the same look. Of course respraying the black on the manifolds is much easier in the truck because the engine is also black, but I can tell you that stuff works GOOD.
Good Luck!

George