Exhaust manifold flange gasket matched. That will let a few more horses out :) (This made an amazing difference) When new, this manifold had a twisted face and required planing by 4mm and als

It always amazes me how manufacturers, esp. with CNC, never manage to match ports properly in the first place. It's only a matter of technique and protocol. From a practical point of view, there's no excuse for them not being spot on these days. Still, looks like you made a good job of it and you'll definitely notice the difference at speed!