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Audi RS6 & RS7 C8 ECU Tuning Guide — EA825 4.0L Twin-Turbo V8 Stage 1, 2 & 3 Power, Mods & GCC Tips (2026)
The Audi RS6 Avant and RS7 Sportback are the most powerful expressions of the Volkswagen Group’s EA825 4.0-litre twin-turbocharged V8 — a platform shared with the Lamborghini Urus, Audi RSQ8, Porsche Cayenne Turbo, and Bentley Continental GT V8. With 591 HP (621 HP in Performance trim) and 800 Nm from the factory, the RS6/RS7 C8 is already brutally fast. But the EA825 has enormous tuning headroom: Stage 1 reaches 690 HP, Stage 2 pushes past 760 HP, and turbo-upgraded Stage 3 builds regularly exceed 900–1,100 HP. This guide covers every tuning stage, supporting modifications, ECU architecture, and GCC-specific advice from...