The next-generation QSB4.5 engine will meet Tier 4 Final near- zero emissions standards with power increased to 173 hp and a peak torque of 520 lb-ft. The 4-cylinder, 4.5-liter engine is enhanced with a Variable Geometry Turbocharger (VGT). The VGT features a unique, one-piece sliding nozzle to precisely adjust the airflow delivered to the engine. This combines the advantages of a small and large turbocharger in a single unit. Cummins, Inc.