Both the GS 350 and GS 460 are equipped with dual Variable Valve Timing with intelligence (VVT-i), which improves efficiency and acceleration. The system continuously monitors the engine's speed and load and then responds by adjusting the intake and exhaust valves to deliver optimum power and efficiency at any speed. The GS 460 also includes an Electronic intake valve control feature (VVT-iE), which improves responsiveness for all temperature conditions.