In 2008, Ford introduced the 6.4 Powerstroke diesel to the Super Duty F-series lineup. The 6.4 was equipped in the 2008, 2009 & 2010 model years. The 08-10 6.4 Powerstroke faced tough emission regulations, sanctioned by the EPA. To meet these stricter emission standards and stay in compliance the use of a diesel particulate filter (DPF) was required. Along with a catalytic converter (CAT) & exhaust gas recirculation (EGR).