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Ahhhh...... My beloved flatheads !!! Unique they are in appearance and sound !!!! Hades i drove mine for 2 weeks with open headers and it was a beautiful racket , and yet even with no exhaust it was not as loud as my "other" truck at that time with duals and glasspacks.
From what I've been reading iron pipe like used for plumbing is considered excellent. 1.5" or 2" straight iron pipes, no mufflers or anything. Not too loud, just right.