I could but why? Pipe manifolds disperse heat much faster than cast iron. Yeah they'll glow red temporarily but they'll cool down quick. On all the race cars I've been involved with, we've never ceramic coated manifolds. I'll be weary of it to start with, especially as I dial it in. I'll be closely watching pyro gauge too. There's a turbocharged 850RWHP VS statesman running 20lb boost sitting in my mates workshop with no ceramic coating on the tuned length pipe manifold, although I do acknowledge its a slightly different setup.
If it gets too hot then I'll think about insulating wrap maybe.