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Message: [QUOTE="eunos, post: 551058, member: 27882"] I was checking the fit of the header pipe into the exhaust port on our 01 426 today and was "somewhat surprised" at the variations in diameters, so I checked them and came up with the following: port diameter 36.5 mm copper seal dia 35.5 mm header at seal joint 38.5 mm weld seam in header 37.5 mm All these sizes occur in a length of 12 mm from the edge of the port! I thought the essence of good exhaust design was to have a smooth a transition as possible especially at the head joint. Anyone got any thoughts or fixes? thanks, Kevin [/QUOTE]