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Message: <blockquote data-quote="westgl" data-source="post: 98003" data-attributes="member: 2025">My bike ran great with the 1-1/4" ID hose the whole run.In going to the 1-3/8"id diameter, i want to see if anything more can be had.Like I said the 1-3/8" is a perfect match to the OEM Manifold ID and provides a Extremely smooth transition.Much better than i had with my 1-1/4"ID.But you never know, I had the face of the 1-1/4" in the flow of the air/fuel mix that may have slowed down the fuel air charge, But it ran Great!So if more volume can be had, i want to at least try it. To see if one way or the other.I can always go to a alum. tube, that is 1-1/4" ID with a 1-5/8" OD alum. tube, that would make a good seal plus the ID would be back to what worked before.</blockquote>