Ur exhaust manifold

[4v6]

As per the title.
Im looking for an Ur exhaust manifold, dosent matter if its cracked, or cracked in half.
I only want it to check the feasability of fabricating a better item, hopefully so that owners dont have to worry about the stock item getting cracked and one that gives a big improvement over the stock item.
Basically i want to produce an item that dosent vent boost primarily from the end cylinders, interfere with exhaust pulses and whilst retaining stock fitment for the wastegate.
I used to have a 5T version donkeys years ago but it got chucked out years and years ago- yep you guessed it, i could kick myself now.

Let me know if you can help.