[Alan X77 Hugger]

Rob,
You can use Mothers Mag & Chrome polish, but depending on how good you want them to look, you may have to have them re-coated. I had a set of Hooker Super Comp headers and after two years and not many miles they just looked like you are describing. The coating from Hooker is not the best, so I had them blasted down and re-coated inside and out. Not sure what level you want to take it.