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BMW M5 G90 — The New Era of M PowerThe all-new BMW M5 G90 represents the most radical departure in M5 history. For the first time, BMW's flagship performance sedan pairs a twin-turbocharged V8 with an electric motor, creating a plug-in hybrid powertrain that produces a combined 727 HP and 738 lb-ft of torque. The G90 M5 sprints from 0-100 km/h in 3.4 seconds, weighs over 2,400 kg, and sends power through an 8-speed automatic to all four wheels via xDrive.The engine at the heart of this system is the S68 — BMW's latest twin-turbo 4.4-litre V8, replacing the legendary...

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...