DALLAS, Texas (September 26, 2005) - Cummins Inc. (NYSE:CMI) announced today during the International Public Transportation Expo that the popular ISL engine will add proven cooled-Exhaust Gas Recirculation (EGR) technology and an integrated Cummins Particulate Filter to meet the U.S. Environmental Protection Agency (EPA) emissions standards for 2007. Unlike today, beginning in 2007 urban bus emissions standards will be the same as other on-highway vehicles. Cummins emissions reduction approach - cooled EGR and exhaust aftertreatment - will be consistent across all Cummins 2007 on-highway diesel engines for North America. Key in-house technologies enable the engine and aftertreatment system to be totally integrated for optimal reliability, efficiency and low cost of ownership.

The new ISL will use cooled EGR for NOx reduction and an integrated Cummins Particulate Filter for PM control; both technologies are in use by the company today. Cummins has used cooled EGR since 2002 and has accumulated over 10 billion miles of actual road experience. The Cummins Particulate Filter, designed to reduce particulate matter emissions by 90 percent from current levels, is developed and manufactured by Fleetguard® Emission Solutions™, a subsidiary of Cummins Inc. Fleetguard Emission Solutions (FES) is the North American market leader in aftertreatment and also has more than an 80-percent share of the North American retrofit business. Over 10,000 FES diesel particulate filters and 1.3 million diesel oxidation catalysts are already in use today. The ISL will continue to feature the patented Holset Variable Geometry Turbocharger (VGT), produced by Cummins subsidiary, Holset.

"Having the right technology - Cummins plus Holset plus FES - allows Cummins to use the best balanced technical solution for optimum reliability. In-house technology combined with a common and stable architecture across product lines assures transit customers of increased uptime," commented Sean Milloy, Chief Technical Officer of Cummins Engine Business.

The Cummins Particulate Filter is designed to last the life of the engine. The filter automatically collects and burns particulates. When there is not sufficient heat in the exhaust, the Engine Control Module (ECM) initiates an active regeneration event so the catalytic reaction can take place. The Cummins Particulate Filter will require periodic service to remove the ash content. A typical urban bus will need this filter serviced only once every 6,000 hours.

The new ISL engine will also feature a crankcase ventilation management system from Fleetguard that virtually eliminates any oil carryover from the engine. (The average urban bus will need to replace the low-cost Enviroguard™ coalescing filter at every third oil change.) The new ISL will feature an enhanced common-rail fuel system which delivers higher injection pressures for lower emissions, increased performance and fuel efficiency. The new ISL will provide the same smooth acceleration as today's product, while delivering the low-end torque necessary for the vehicle to stay on schedule. Ratings will be the same as today. Best-in-class low life cycle costs (service intervals, fuel efficiency, overhaul costs) and long-life durability will be maintained. Maintenance intervals will be unchanged.

Cummins leadership in the North American urban bus market since 1998 can be attributed primarily to the success of the ISL.

"Cummins is committed to the urban bus market worldwide. We offer a product for every transit need, including a full range of diesel engines, natural gas engines and diesel electric hybrids," stated Roe East, Cummins General Manager of Worldwide Bus Business. "Our entire product menu will move forward into 2007. Backed by Cummins extensive aftersales support network, Cummins product portfolio provides a dependable, reliable solution for every route," he added.

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. With more than 28,000 employees worldwide, Cummins reported sales of $8.4 billion in 2004.