I just randomly found this:
https://mr2-ben.co.uk/products/649
Looks good. And a great alternative for those who need a stockish look to pass visual inspection (which I heard is a common thing in several states in USA.
If the point is only visual inspection then fair enough.. bet the performance of airflow through the larger volume (empty cat cylinder) vs buying a proper decat manifold and "adding on" the cyclinders to the outside to give the impression that there were precats would yield better performance..
Maybe ask them how they've made it?