The 123CITROEN-2CV-EVO offers vacuum advance and many different advance curves, 5 for tuning with regular fuel, 5 for tuning with LPG/ethanol and 5 ‘standard’-curves as prescribed by Citroen for ALL two cyl.-engines, inclusive VISA-engines. The 123CITROEN-2CV-EVO is designed to work in conjunction with the stock ( black! ) coil!