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G63 AMG Downpipe Guide — W463A M177 Catted vs Catless, Power Gains & Sound
The Mercedes-AMG G63 W463A houses the same M177 4.0-litre twin-turbo V8 found in the C63 — but in a body-on-frame SUV that weighs over 2,500 kg. With 577 HP from the factory, the G63 is absurdly fast for its size. But the factory exhaust system, constrained by emissions compliance and the G-Class’s unique exhaust routing to the distinctive side-exit pipes, leaves meaningful power on the table. Upgrading the downpipes is the single most effective bolt-on modification for unleashing the M177’s full capability in the G-Wagen chassis. The G63 Exhaust Challenge The G63’s exhaust system is unique. The hot-vee M177 engine...