Exhaust manifolds with exterior D=40mm for 180 triple engines

[iLaverda]

Does anybody know the material thickness of exhaust manifolds with an exterior diameter of 40mm? Is it closer to 1,50mm or 2,00mm? And which exterior diameter measures the ring which gets hold by the exhaust roses? It's a relevant information once you'll optimize the outlet port of your cylinder head.

I furthermore would be happy once you let me know who supports a chromed set or one in INOX steel in Europe?

Thanks for your help
Dominik

 

[motoddrob]

Just measured my headers, 42mm O/S 38mm internal, but they are custom made copied from my original 3/1 Motodd pipes. Also have ceramic coatings.