700 HP RSS

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...

The BMW F90 M5 uses the S63B44T4 — a 4.4-litre twin-turbo V8 that produces 591–617 HP from the factory depending on variant. It is one of the most potent sedans ever built, and it has substantial untapped potential locked behind factory exhaust restrictions. The stock catalytic converters downstream of each turbocharger are the primary bottleneck, and replacing them with performance downpipes is the foundation of any serious M5 build. Why the S63 Needs Downpipes The S63 positions its two twin-scroll turbochargers outboard of the cylinder banks in a traditional hot-outside-vee layout. Each turbo feeds exhaust through its own catalytic converter...