The Tier3 and Stage IIIA Cummins QSB6.7 takes you to a whole new level of power, versatility and emissions control. It achieves Tier 3 and Stage IIIA compliance with in-cylinder technology that maintains a compact and simple installation that provides premium performance to every construction application. This new 6.7-liter diesel is ready to handle your toughest job. It offers major enhancements that make every piece of construction equipment work harder, smarter, quieter and longer.