SI-DRIVE alters vehicle performance characteristics by regulating the Engine Control Module (ECM) and by fine-tuning the Electronic Throttle Control system. With Intelligent mode selected, SI-DRIVE provides a more relaxed throttle response curve. "Sport" mode provides quick throttle responses and powerful, linear acceleration. In "Sport Sharp" mode, SI-DRIVE modifies the engine's electronic throttle mapping to deliver super-quick throttle response and put down the power sooner.