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We optimise the original ECU software of your BMW 523i (E39) with the M52B25 engine individually, for more power, more torque and sharper throttle response. You order online and flash the finished file yourself via OBD.
You put together stage, extras and hardware yourself. Today you only pay hardware and a 5 € deposit, the software once it is ready.
Software from150 €
Configure nowWe adjust the maps in the original software of your MS41 ECU, depending on the engine e.g. boost, injection, ignition timing and limiters. The goal: noticeably stronger pull, sharper throttle and power delivery that suits the vehicle.
Every tune is based on the original software read from your vehicle and adjusted individually. No one-size-fits-all, no copy-paste from a database.
The original stock software can be restored at any time.
| Feature | Stock | Stage 1 | Stage 2 |
|---|---|---|---|
| Power | 170 PS | ca. 182 PS | ca. 190 PS |
| Torque | 245 Nm | ca. 270 Nm | ca. 282 Nm |
| Additional hardware | – | none (software only) | headers and/or 200-cell sport cat |
| Software price | – | 150 € | 200 € |
Power figures are calculated estimates, not dyno measurements. Requires higher-octane fuel; no specific output is guaranteed.
Configure & order
Choose stage, extras and hardware. Today you only pay hardware and a 5 € deposit.
Upload the original file
Read the software from your ECU and upload it to the customer portal.
Individual calibration
We adjust your file by hand, usually within 48 hours; very modern vehicles may take longer.
Pay & flash
Pay the remainder (deposit credited), download the file and flash it yourself via OBD.
No franchise, no mass production. Every tune is handcrafted.
Usage notice
The software change voids the type approval of your vehicle. The software is intended for motorsport use only. Learn more
BMW 523i (E39) · M52B25