How to Polish Wastegate Max flow for Compounds

Ive been reading on this forum of a few members that state they have polished there wastgate port and exhaust housing to help with exh flow.

Im looking to run an s362 / s476 and would like to touch 750 to 800 hp max. but im trying to keep the 62 from over speeding.

Any suggestions on how to polish the internals of the exh housing and wastegate areas?

Oh, and the reason for this small setup with my 6.7 is for quick spool and roll in throttle with not a lot of smoke. thanks..

I wouldn’t waste *har har* my time with polishing the gate ports, maybe gasket match the gasket flange with manifold but even that is debatable on what it’s really gonna improve.

I know Gillette diesel used to drill out the wastegate ports and put bigger pucks on them but dunno if that’s a thing anymore. There’s also a Borg Warner dual internally gated T4 .83 housing that I always thought would be interesting to run.