1nzfe equal length manifold.

[Blown_xa]

I see where you guys are talking about, but what you have to realize, anything withinn 2 " is considered equal length. That is industry standard. The inside runners are 3/4" shorter than the outside ones, that is considered equal length.

That is cool that you made a manifold parmas, I see where you were going with that design. However, you don't want to compromise over-all flow just to try to get perfect length runners because that defeats the purpose. Only one bend per runner is used in the hayabusa design, along with a side-by side collector. Having runners enter the collector (especially a shallow collector) at different angles such as yours also defeats the purpose of achieving equal length design.

Factory exhaust manifold runners have a difference of 5", just food for thought.