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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 S58 3.0-litre twin-turbocharged inline-six is the engine behind the G80 M3, G82 M4, G87 M2, F97 X3 M, and F98 X4 M. It replaced the S55 in 2021 and immediately raised the bar for factory power in the BMW M lineup. The standard M3 and M4 produce 473 HP and 406 lb-ft. The Competition and CSL variants produce 503 HP and 479 lb-ft. The M2 G87 produces 453 HP. BMW's factory calibration on the S58 is among the most conservative in the performance segment. The engine uses forged internals from the factory — forged crankshaft, forged connecting rods,...