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13. This photo is actually from a few steps ahead but it shows something critical. The manufactured end of the cone measures about 1 5/8 inch but this header’s pipes measure 2 inches, meaning Carlyle had to trim them to fit. That his flanges measure 3 1/2 inches means he can’t cut the big ends. So this is as short as he can make a header, which underscores the reason to start with the rearmost-offset cylinder bank if the shortest, matching-length headers possible are the goal.