I see a Dutch company do a manifold....
https://www.dp-engineering.nl/index.php/citroen-peugeot-equal-length-xu-16v-turbo-manifold-welders-nightmare.html
Looks pretty decent. Obviously stuff will have to be moved and other work done but I prefer this to SC,
Would be looking for about 370-400hp so I reckon a decent GTX2860 would probably do the job nicely.
Any thoughts?
TT