A novel modular single exhaust manifold called swirl turbocharging exhaust system is described. The flow field was modeled and compared with the flow behavior in MPC system. Numerical calculation results of the manifold flow show that its flow field characteristics were different from that of the MPC’s. To investigate the efficient two swirl turbocharging exhaust systems were designed and applied to two turbocharged diesel engines respectively. The test results reveal that both engines with the new type turbocharging system have promising performance.