Mitch, you can mirror polish the exhaust side if you have the time. There is often some lumpy welding on the downpipe flange and blending the 2 together at that junction not a bad idea.
Having said all that, some people, P Singher I think, likes a mismatch at the head to manifold junction as it causes a back pulse that aids chamber filling and extraction. This is partly down to the bad exhaust port design and shape. Black Arts indeed.
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