So there wouldn’t be any problemsBecause it's iron and iron rusts.
thanks for this info. It just really helped me stop from over thinking lolTo expound on Zrk's reply:
Several components in a turbo setup are made of iron. This improves durability, reliability, and heat tolerance compared to other metals. This iron is exposed to aggressive heating/cooling cycles. This causes a harmless layer of iron oxide (rust) to form on the exterior. This is totally normal of turbo setups that use cast iron hotsides and/or manifolds.