I used Eastwood Stainless Steel paint on mine. They looked perfect for about 5 years - starting to show a little aging now, though.
Don't buy it until you're ready to use it - it has a short shelf life - like about 6 months unopened, and about 6 weeks once the can has been opened up.
I bead-blasted the manifolds, then brush on the coating. Best results achieved by baking them in an oven - I didn't have that available, so I just put them back on the car & fired it up. They smoked for about 15 minutes, everything was fine after that.
Jeff