The incoming PostEuro6 regulation and the on-board diagnostics -OBD- pushes the research activity towards the set-up of even more efficient after treatment systems. Nowadays, the most common after treatment system for NOx reduction is the selective catalytic reactor –SCR- . This system requires as an input the value of engine out NOx emission –raw- in order to control the Urea dosing strategy. In this work, a grey box NOx raw emission model based on in-cylinder pressure signal (ICPS) is validated on two standard cycles: MNEDC and WLTC using an EU6 engine at the test bench. The overall results show a maximum relative error of the integrated cumulate value integral of 12.8% and 17.4% for MNEDC and WLTC respectively. In particular, the instantaneous value of relative error is included in the range of ± 10% in the steady state conditions while during transient conditions is less than 20% mainly. Finally, a sensitivity analysis is conducted in order to evaluate the response of the model to any air and fuel parameter deviation.