Stainless steel manifold

[Bdevo3]

Hoping this is the right forum and one of you guys could help me out or tell me if I'm wasting my time. So I have my little evo engine back together and any thing that hasn't been replaced ancillary wise is being blasted and painted but I'm stumped on the stainless four branch as it has become discoloured. Is their anything that can be done to revive it or am I better off sticking a heat wrap or shield on it