A centrifugal compressor system includes a centrifugal impeller a shroud in cooperative engagement with the impeller; and a diffuser. The diffuser has a hub surface; a shroud surface; a plurality of diffuser vanes extending between the hub surface and the shroud surface; and a common splitter ring disposed between the hub surface and the shroud surface and intersecting each of the diffuser vanes along a span of each of the diffuser vanes.