Turbo lag is defined as the time delay before the turbocharger has produced boost pressure.
ALS (anti-lag system) is an engine management technique that allows to minimize the turbo lag time.
Anti-lag is when a turbocharger is subjected to a very late burn causing the exhaust to expand in the turbine housing. This energy is concentrated at the turbocharger causing a very quick turbo spool up. The EMS supports two different types, including a rally style and drag race antilag.
4G6 secondary air control