Have a friend with a 190 2.3 16 that has a cracked exhuast manifold.
What is the success rate at welding or where can you find a replacement or headers?

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2009 Mercedes ML320 Bluetec

I think this was a known issue with early 2.3s and later ones had strengthening added - might be worth looking into this.
They come up on ebay occasionally in Germany.

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190E's:
2.5-16v 1990 90,000m Astral Silver
2.0E 8v 1986 107,000m Black 2nd owner
http://www.maylane.demon.co.uk/190esmall.jpghttp://www.maylane.demon.co.uk/190esmall2.jpg

I would try to weld it, what have you got to lose? If it does not work then look for a different one.(junkyard)