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Message: [QUOTE="Black_Lightning91, post: 321807, member: 2972"] Okay so I pointed this out in Craigs changing it up thread but no one noticed I guess. I am wondering why none of the ported manifolds have a cross over tube at the back? Seems Navi decided that it was needed for better more evn airflow to the back cylinders. I have noticed any of the big comp manifolds for cummins/duramax is a log type with runners coming off that. Where the 6.4 is a kinda split. Could the firing order of the engine and the fact that the air has to travel down each side seperatly cause flow issues? What If someone made a cross over tube maybe 1-1/2" or 2" in dia if this would allow the air flow to even out and help with back cylinder breathing. Clearly the idea has merit or why else would navi invest all the money to add that to their newer engines?? Also proves that back cylinder breathing is an issue with the 6.4 powerstroke which did not have this update. Just a question since I dont have the equipment or funds to design my own intake manifold and prove or disprove my theory! [/QUOTE]

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