MHI RSS

The BMW S58's twin-turbo system is the single most important factor in why this engine responds so dramatically to ECU tuning. The combination of mono-scroll turbochargers from MHI Group, cast-integrated exhaust manifolds, and electric wastegate actuators creates a boost control architecture that is fundamentally more precise, more responsive, and more tuneable than the S55 system it replaced. At YPG Motorsport, we've calibrated hundreds of S58 engines. The turbo system's design is the reason a Stage 1 tune on the M3, M4, or M2 delivers gains that feel disproportionately large — the hardware has significant headroom that the factory software intentionally...