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Maybe a long shot but was wondering if this has been done with any real success . Not just port matching which is easy enough but actually opening up the interior a bit. In some searches I have seen Extrude honing and acid being poured into the manifold but I think the latter was mostly for cast...

My next project on my 69 Fury III is a new exhaust system. I have a few ideas as what to get installed as far as pipes and mufflers but I have a question for you all as to what look to have at the rear end. What diameter of pipes at the end,,chrome tips, facing down or straight out,,how far...