Sigh, it sounds like a I might have the dreaded cracked manifold problem so common to our wonderful 4x4s.

Since I'm down there, I thought I might as well try and upgrade the exhaust system, but have not had any luck finding headers for the Montero.
As far as I can tell, all the Australian and SA headers of the time are designed for Pajeros/Monteros with the single cat.

US spec Monteros have the 3 cat setup (2 hot and 1 cold), like on the 2008+ Mitsubishi Pajeros.

Is anyone aware of headers/extractors (NOT exhaust manifold) for the US spec 2003 Mitsubishi Montero Ltd ?? And if so, where I might be able to find them?

Thanks