LOUISVILLE, Ky. (November 29, 2006) - Cummins Inc. (NYSE:CMI) today introduced a new 350-horsepower diesel engine for motorhomes, the ISB XT, at the RVIA (Recreation Vehicles Industry Association) show. The ISB XT combines industry-leading fuel economy and the highest power-to-weight ratio in its class. XT refers to extra horsepower for acceleration, extra torque for hill-climbing ability, extra stopping power from integrated engine braking and extra value with the lowest operating cost of any engine in its class.


The ISB XT carries forward many of the proven components of its predecessor, the 5.9-liter ISB, with the patented VG Turbo, a proven cooled Exhaust Gas Recirculation (cooled-EGR) system and sophisticated Interact™ System electronic engine controls. Modifications for 2007 include a 13-percent increase in displacement to 6.7 liters, an increase in horsepower to 350 horsepower and a higher peak torque rating of 750 lb-ft - while maintaining the same exterior dimensions as the previous model.


"The new ISB XT will keep Cummins as the RV industry's favorite diesel engine" said Mark Conover, Cummins Director - RV Business. "It not only delivers extra performance, it provides motorhome manufacturers with advantages such as a 100-pound weight advantage over the competition for better chassis balancing and increased floor plan flexibility. Plus, its compact size makes it easier to install, gives easier access to maintenance points and provides additional storage space."


Vehicle performance tests have proven that the ISB XT delivers quicker acceleration than competitive engines in the same horsepower range. A higher operating speed (2600 rpm) allows for a lighter torque converter match, enhancing engine responsiveness. It also allows for an Allison transmission shift logic that optimizes the performance curve for maximum vehicle performance. The patented VG Turbo has new electric actuation to improve engine responsiveness at every rpm. Equally important to RV customers is the fact that it provides extra braking power, eliminating the need for installation and maintenance costs associated with an aftermarket "add-on" brake. The extra driver control is especially important on steep downgrades and when towing.


The ISB XT is designed to comply with all 2007 EPA emissions requirements, using an integrated package that includes Cummins Particulate Filter to reduce particulate matter emissions by 90 percent from current levels and a crankcase ventilation system to capture crankcase gases and return them directly to the sump. All components are designed and manufactured by Cummins for optimum performance with minimal maintenance, and are covered under a comprehensive 5-year, 100,000-mile (160,935 km) warranty.


The ISB is Cummins most popular current engine model, with over three million units sold. Warranty and repairs are handled through Cummins parts and service network, the largest in North America with over 3,500 authorized locations, including Cummins Coach Care dealers and distributors, who operate special facilities dedicated to RV customers.


Cummins Inc., a global power leader, is a corporation of complementary business units that design, manufacture, distribute and service engines and related technologies, including fuel systems, controls, air handling, filtration, emission solutions and electrical power generation systems. Headquartered in Columbus, Indiana (USA), Cummins serves customers in more than 160 countries through its network of 550 company-owned and independent distributor facilities and more than 5,000 dealer locations. Cummins reported net income of $550 million on sales of $9.9 billion in 2005.