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As diesel engine emissions standards become increasingly stringent, a commonly employed method of emissions reduction by engine manufacturers is active control of inducted air and the use of EGR. A common system configuration includes actuators such as an EGR valve and a VGT are used to manipulate the air flow through a diesel engine to control desired in-cylinder conditions so that the combustion event produces reduced engine out emissions. This paper evaluates four different controller designs for control of a diesel engine air path using a VGT & EGR valve in order to explore trade-offs between system performance and system complexity: three built up from SISO transfer functions and one that is a fully multivariable design. Various performance metrics are analyzed to gauge the relative difference in performance capability while attempting to maintain simple controller architecture.