Great question, one I would have asked way back when but would safely assume now... well, Because I didnt really finish the short turn for this valve and turbulence takes over pulling the air to one side and no longer flowing more air. Specifically the straight side short. I ground down the wall hump and went into the straight wall in the process... but then you need to position high in through the port window and grind down toward the valve/bowl and make the shape that completes the other dog leg side short. Maybe I'll continue, but I'll have to do it all over again when the 2.02 is in like I said in that post you quoted. We could see much more if this was the finish valve size.