Originally Posted by cu260r6
Can someone help me out with which part # is actually a 3 stage manifold? I get the distinction between the 11617584524 and 11617584523 that are talked about in this thread. But which one is 11617584525? It comes on the 2011 528i which had 240hp and 230tq which is right in the middle of the x28i and x28is motors that use the previously mentioned part numbers. If it's not the 3 stage does anyone know how they gained 30tq/10hp in the last gen NA N52 motor?
the ##25 manifold features a heat sink and needs a new engine cover and heat sink with gaskets in addition to the standard disa adjusters
Its the most expensive option that seems to be designed for longetivity. I guess they tested that cylinder bank 2 and 4 get the most hot and need q heat sink.
I would avoid any manifold from 330i and 530i due to age. also the oil cooler will need to be removed from them.
Try to find a true n51 manifold or one from x3, x5
they are direct bolt ons.