Scania’s integration of XPi high pressure common rail injection and selective catalytic reduction has enabled the Swedish engine maker to meet 2014 Stage IV/Tier 4 Final emissions regulations without a diesel particulate filter. “Developments in metallurgy have helped to strengthen components and lead to increased injection pressures, typically up to 2400 bar,” said Scania industrial engine sales director, Bernt Gustavsson. “A compact DOC is neatly integrated into the SCR system, which saves on space needed