Gen 1 Exhaust header E.X.U.P. Valve housing

[Decoke Dave]

Wondering what material these things are made from? Anyone had any success in welding up the stripped valve housing retaining threads and re-tapping them?  I hate helicoils!  Being time served in engineering and having full access to all the necessary workshop machines and tools it would not be difficult if the material is weldable, possibly using a T.I.G. set up?
                              P.S. Forgot to say even if weldable will it go very hard and thus unable to drill it?

[NorthWestern]

I welded a spring hook on for an akrapovic pipe, the collector box is stainless. Welded fine though...

[Decoke Dave]

........Thank you very much indeed!  Stainless is the best possible outcome!  Easily welded with a T.I.G. set up.  Job should be fairly simple. .   

[bludclot]

Has anyone sanded and polished a collector? If so how did it come out? Now that I know mine is stainless I want to be shiny...

[NorthWestern]

I cleaned up the area before welding. Didn't take long to return to the dusty brownish colour so suspect it would need some maintenance polishes quite frequently...