 It is a naturally aspirated engine with 16 valves and belt driven double overhead camshafts (DOHC).bore and stroke in cast-iron OHC-derived cylinder block and aluminium cylinder head.The "X20XEV" was equipped with exhaust gas recirculation (EGR) to reduce nitrogen dioxide emissions and air injection reactor (AIR) to speed up the warming up of the catalytic converter and to reduce unburnt hydrocarbons and carbon monoxide.