BMW X3 (G45) 2024> M50 MH 398bhp remap figures
Thinking of remapping a BMW X3 M50 MH 398bhp? The standard car makes 398bhp and 580Nm; with a Stage 1 remap from our Leicester workshop we expect around 465bhp and 669Nm, up to +67bhp and +89Nm.
Choose your map
Stage 1 remap figures
A Stage 1 remap is a software-only change to the ECU on an otherwise standard car. It needs no extra parts, which makes it the usual starting point.
| Stock | Vanguard expected | Expected gain, up to | |
|---|---|---|---|
| Power | 398 bhp | 465 bhp | +67 bhp |
| Torque | 580 Nm | 669 Nm | +89 Nm |
All maps at a glance
| Map | Power | Torque | Expected gain, up to |
|---|---|---|---|
| Stock | 398 bhp | 580 Nm | |
| Stage 1Maximum software-only performance | 465 bhp | 669 Nm | +67 bhp +89 Nm |
| Stage 1 EcoPerformance with economy in mind | 448 bhp | 662 Nm | +50 bhp +82 Nm |
| Eco mapEconomy first | 443 bhp | 657 Nm | +45 bhp +77 Nm |
Who is the Stage 1 map for?
- Drivers who want a sharper throttle and a small, honest gain from software alone.
- Owners who would rather keep the car standard in every other way.
- Anyone who wants the fullest software-only map for this engine, accepting that the gain is modest without a turbocharger.
What this means for your X3
Naturally aspirated petrol engines have no boost to raise, so gains from software alone are more modest than on a turbocharged car and come from fuelling, ignition and throttle response.
Engine management is by a Bosch MG1CS201 unit. Newer ECUs often protect their software, so we read the exact unit and version on the car before confirming the figures on this page.
We remap at our Belgrave Gate workshop in Leicester, or at your home or work within 30 miles, and every job starts with a diagnostic check.
Please note: these are expected figures, not guarantees. Real results vary with the condition of the vehicle, the ECU software version, fuel quality and the hardware fitted. Some options - including Stage 2 and anything that needs extra hardware - are for off-road or competition use only. We check every vehicle first and confirm what is achievable before any work starts.
Figures reviewed 22 October 2026.
Stage 1 questions
How much power does the Stage 1 map give the BMW X3 M50 MH 398bhp?
We expect 465bhp and 669Nm against 398bhp and 580Nm as standard: up to +67bhp and +89Nm. These are expected figures, and we confirm what is achievable on your own car after a diagnostic check.
Does a Stage 1 remap need any extra parts on the BMW X3 M50 MH 398bhp?
No. Stage 1 is a software-only change to the ECU on an otherwise standard car.
Is there a gentler map than Stage 1 for this engine?
Yes, two. Stage 1 Eco is performance with economy in mind: 448bhp and 662Nm expected. The Eco map is economy first: 443bhp and 657Nm. Both still sit above the standard 398bhp and 580Nm.
Do I need to tell my insurer about a remap?
Yes. A remap is a modification, so you should declare it to your insurer.
More BMW X3 figures
Other petrol variants
All petrol X3 (G45) variants · X3 (G45) 2024> overview · All BMW figures