To continue efforts towards improving air quality and achieving Read World Driving emissions targets, it is accepted thatLight Duty Diesel powertrains have to maximize the NOx reduction performance of exhaust aftertreatment systems. Therefore Ricardo have continued to study the optimum configurations and thermal management techniques to improve conversion efficiency across all driving styles. The paper will consider what aftertreatment types, positions, and heating methods can achieve these goals towards post Euro 6 emissions levels, by assessing conversion efficiency profiles over WLTP and RDE cycles.