Anti-lag is a system used to reduce turbo lag or effective compression used on turbocharged engines to minimize turbo lag on racing or performance cars. It was originally devised for rally cars to keep a turbo spinning at full boost even at low engine RPM. The system works by delaying the ignition or enriching the fuel/air mixture to create spark within the exhaust manifold so that when the driver lifts, spark occurs and keeps the turbocharger spooled. Anti-lag can work in two different ways, depending on the system and car. First, an adjustment of the ignition timing can create spark within the exhaust as the driver lifts the throttle. Second, enriching the fuel/air mixture can induce spark within the exhaust manifold so that when the driver lifts, spark occurs and keeps the turbocharger spooled. Anti-lag is famous in rally racing, requiring instant boost pressure for accelerating out of corners. With an anti-lag valve in use, it shoots constant flames through the turbocharger to keep it spinning. One of the drawbacks of using anti-lag is that it will put more stress on the turbo, reducing the lifespan of the part.