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This manuscript describes recent design developments and extensive testing of ART-EGR systems (Aerodynamically Regenerated Traps with Exhaust Gas Recirculation). Such systems have been proven to drastically reduce the emissions of particulates (by up to 99%), NOx (by up to 50%) and unburned volatile hydrocarbons (typically by 30-70%). Such emission reductions, however, are associated with increased fuel consumption. In this work extensive design modifications were implemented to minimize the fuel consumption penalty caused by the ART-EGR system. All plumbing and valving gear has been redesigned to maximize the flow of regeneration air through the primary filter monolith. An expansion chamber integrated with the ART system, downstream of the primary filter, increased the flow of the regeneration air. At the exit of the expansion chamber, a secondary filter/burner retained and oxidized the soot.