Select model catalog: Cummins QSB6.7 CM850(CM2850)- Tier 3 (Hagie) PC13824 Cummins QSB6.7 CM2250-Tier 4 interim (Hagie) PC13825 Cummins QSB6.7 CM2350 B105-Tier 4 Final (Hagie) PC13826