Cummins Diesel Engine Emission System For the past 3 years we have been buying International school buses CE models equipped with DT 466 Maxxforce and MaxxForce 7 engines. For 2014 International CE school buses will be coming with the Cummins ISB engines since IC can not meet emission standards. The big difference is the DEF… Continue reading Cummins 2010 Diesel Engine Emission System