Vee_Que;36407 wroteIt will be done on a milling machine for the most part. You would have fun getting it done on a dremel for the rest. I'll get this lotdone go from there I guess as the one on my car was done with an air die grinder.
Excellent. I'm keen to see how far you manage to get into it with the mill head.
OldnDecrepit;36411 wroteWould this be worth doing on a NA 16V unit - especially if I intend to run a supercharger?
There would be performance gains to be had on anything if it is a cast part, but if you're talking about an exhaust manifold, it'd be far more practical and bring about a bigger gain if you ditch the cast manifold altogether and have a decent set of extractors made.