S58 Stage 2

Engine + Fuel System. ECU + FlexFuel

Stage 2 is a fully integrated performance system for BMW M vehicles powered by the S58 engine.

It combines ECU tuning, optional transmission tuning, and FlexFuel capability to deliver extreme power, faster shifts, and full fuel flexibility — without sacrificing drivability or OEM safety systems.

What you get

✔ Up to 750–800 horsepower potential (fuel dependent)

✔ Massive gains in top-end and mid-range power

✔ Automatic fuel blending (pump gas or ethanol)

✔ Sharper throttle and stronger acceleration

✔ Full tuning control through the MHD app

What’s included

✔ DME unlock

✔ MHD ECU tuning with full access

✔ FlexFuel kit professionally installed

✔ Mobile DME removal and reinstallation

✔ (Optional) xHP transmission tuning

How it works

We come to you, remove and unlock the DME, install the FlexFuel system, and return your BMW fully configured and ready to run.

Typical turnaround: 5–7 business days

Your BMW stays with you the entire time.

Compatible with

BMW M2, M3, M4, X3 M, and X4 M equipped with the S58 engine.

Stage 2 transforms the S58 into a true high-output performance platform — engine, fuel system, and software working together to deliver the maximum power this platform can safely produce.