3.2 911 question

Hope this car isn't too new for this site. Never sure where to ask questions about this vintage car.
So this is an 84 Carrera 3.2 motronic fuel injection European Delivery recently acquired by me.
Has anyone seen an intake manifold welded like this before?
The car has an Andial muffler on it and I'm just curious what might be going on with the intake manifolds.Attachment 455706

Sorry for the sideways pic.

Probably cut open to polish the intake runner on the inside for performance reasons.

Yeah kinda what I thought. Just wondering if anyone recognizes that a particular tuner does this?