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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?
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