A turbocharged engine control system is provided that comprises an exhaust gas after-treatment system and a variable-capacity turbocharger. Non-porous microscopically rough ionization surfaces are used to absorb analyte in situ for subsequent ionization by laser light and release of gas phase analyte ions. The inlet includes a v-shaped lip open to freestream airflow in one side of the inlet. One such transition layer includes pliable material and deformable holes within the pliable material.