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Perkins Technology has developed the technology for a Euro III compliant High Speed Direct Injection (HSDI) diesel engine. A prototype engine was built both to demonstrate this technology and the production feasibility for application to the executive car market where NVH performance was seen as the critical driver. This paper expands upon the approach used for the NVH aspects of the design, analysis and verification of the engine and its installation in a typical executive car. Results for both the powertrain and the vehicle installation are presented showing class leading NVH performance.