The twin turbochargers operated in sequential mode instead of parallel. Initially, all of the exhaust gases are routed to the first turbine for reduced lag. This resulted in boost and enhanced torque as early as 1,800 rpm, where it already produced of torque. At 3,500 rpm, some of the exhaust gases are routed to the second turbine for a "pre-boost" mode, although none of the compressor output is used by the engine at this point. At 4,000 rpm, the second turbo's output is used to augment the first turbo's output. Compared to the parallel mode, sequential mode turbo chargers provide quicker low RPM response and increased high RPM boost. This high RPM boost was also aided with technology originally present in the 7M-GE in the form of the Acoustic Control Induction System (ACIS) which is a way of managing the air compression pulses within the intake piping as to increase power.