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Audi RS6 vs Mercedes E63 vs BMW M5 — The Super Sedan Tuning Showdown | 2026 | YPG Motorsport
RS6 vs E63 vs M5 — Which Super Sedan Tunes Best? The Audi RS6 Avant, Mercedes-AMG E63 S, and BMW M5 Competition represent the holy trinity of super sedans. Each delivers north of 600 horsepower from a twin-turbo layout, each costs well into six figures, and each attracts a specific type of owner. But when it comes to tuning — ECU calibration, bolt-on modifications, and outright power potential — these three respond very differently. This guide breaks down exactly why, with real-world numbers. Comparison Table: RS6 vs E63 vs M5 Stock & Tuned Spec Audi RS6 Avant (C8) Mercedes-AMG E63...