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Message: <blockquote data-quote="westgl" data-source="post: 99105" data-attributes="member: 2025">The center Intake should be slightly higher than the tubes i use a level to make sure every thing is sitting right, before i tighten anything down.My thought is to go with the OEM manifold ID's which are the head port sizes, for a smooth flow.But then tube size kept getting smaller, then smaller, to correct some running conditions, and provide more low end torque that Rev.1 had.Now at 1-1/4"ID tube with a choke in the plenum. I am going to try the opposite.Joe and i both tried the Hoses if Joes hoses were collapsing like mine were, That might tell us that the hoses were self choking further down the hose, but I dont know if Joe felt the hoses to see their condition while riding the bike or not, to see if they were collapsing.Maybe Going to open at the plenum, and squishing down to smaller toward the last 1/3 or 4th of the tube runner, then opening back up to full sized ID again before the 90 degree bend. That is my next test</blockquote>