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The Mercedes-AMG GT lineup (GT, GT S, GT C, GT R) is one of the most sonically impressive platforms AMG has ever produced. The M178 4.0-litre twin-turbo V8’s hot-inside-V turbocharger layout and flat-plane-inspired firing order give it a distinctive character that sets it apart from the M177-powered sedans and SUVs. But the factory exhaust system — while tuned for a refined balance of performance and daily comfort — leaves significant gains on the table in both sound quality and outright power. This guide covers the full exhaust upgrade path for AMG GT M178 models, from downpipes to valved exhaust systems,...