I was browsing the worlds largest auction site today and under a search of 6.2L Diesel, I found a single plane and dual plane Non EGR Intake Manifold for a 6.2L. Is there any pros or cons to either of these. Just curious:) .

i think they are just diffrent years they use diffrent cdr's one is in the valve cover other is up on the alternator bracket

No realistic advantage either way IMHO. Just a different design.