BMW M5 RSS

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...

The BMW M5 F90 is the most potent iteration of BMW's legendary super sedan, powered by the S63B44T4 — a 4.4-litre twin-turbocharged V8 producing 600 HP in standard trim and 625 HP in Competition spec. With boost levels held conservatively from the factory and a robust bottom-end forged rotating assembly, the S63 in the F90 is one of the most rewarding platforms in the BMW M lineup to tune. Stage 1 ECU calibration alone pushes past 700 HP, while full-build Stage 3 configurations regularly exceed 1,000 HP on pump fuel. This guide breaks down every tuning stage, the hardware each...

The BMW M5 F90 is one of the most capable super sedans ever built — a 4.4-liter twin-turbo V8 producing 600 HP in standard form and 617 HP in Competition trim. But the factory exhaust system doesn't match the car's potential. It's heavy, over-muffled, and tuned to meet global noise regulations rather than deliver the sound a twin-turbo V8 deserves. If you're looking for the best exhaust upgrade for the F90 M5, this guide covers everything: titanium vs stainless steel, valvetronic vs straight pipe, weight savings, and which system is right for your driving style. Why Upgrade the F90 M5...

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...