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Good gearbox control is essential when tuning a car, as it has a direct impact on the car's performance, efficiency and driving experience. The gearbox control coordinates the interaction between engine and transmission, making it possible to use the engine's power optimally and achieve the best acceleration. By fine-tuning the gearbox control, you can adapt the gear shift to your specific driving style and preferences, which can provide smoother gear changes, improved fuel economy, and increased drive torque. Furthermore, it can provide better control at high speeds and under hard acceleration.