This project was focused on a comprehensive performance upgrade for the Mercedes-Benz AMG GT S. The main emphasis was placed on improving engine operation, exhaust system efficiency, advanced thermal management, and stable power delivery under sustained load.
The vehicle is equipped with a 4.0-liter V8 biturbo engine (engine code M178), delivering strong power and torque in factory configuration. Prior to tuning, a complete maintenance service was performed, including inspection of the fuel system, fuel quality, oil and coolant lines, gearbox, transmission, and chassis. This ensured a reliable OEM baselinebefore performance modifications.
This approach enabled a smooth transition from Stage 1 to a full Stage 2 configuration, focused on a tangible performance increase and long-term durability.
The core hardware upgrade involved the installation of a high-performance exhaust system from the Evolution Line, featuring increased flow capacity and optimized catalytic functionality. This package and kit significantly improve exhaust gas evacuation and turbo operation, while also providing a foundation for potential future turbocharger upgrades. The use of titanium and carbon elements reduces weight and creates a deep, controlled sound character, delivering the distinctive V8 roar across the entire rev range.
Additionally, Redstar catless downpipes were installed to further enhance exhaust efficiency. The downpipes feature an integrated 10 mm thermal insulation layer between the pipe and the heat shield, allowing external surface temperatures to remain around 250°C even when exhaust gas temperatures reach up to 800°C. This solution effectively protects surrounding engine bay components — including air filters, filter housings, wiring, and other nearby elements — from excessive heat exposure.
Improved thermal management reduces heat load on the engine and enhances reliability during aggressive driving. Optimized airflow positively affects turbocharger operation and impeller efficiency, resulting in faster throttle response and increased torque. These improvements also enhance wheel traction, vehicle balance, and overall driving confidence.
To fully utilize the installed hardware, professional ECU chip tuning and precise software optimization were carried out and validated on a dynamometer. The calibration accounted for airflow characteristics, fuel consumption, and thermal operating limits. As a result, a noticeable power gain was achieved, reaching approximately 630–640 horsepower, while maintaining smooth drivability and stable gearbox operation.
This project clearly demonstrates DEIZ GARAGE’s engineering-focused approach, where hardware components, software calibration, and thermal management function as a unified system — delivering increased power, improved engine performance, and reliable operation without compromising everyday usability.
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