BMW 3 Series (G20) 2021> M3 Competition 503bhp remap figures
Stock, this 2021> BMW 3 Series petrol (3.0L) produces 503bhp and 649Nm. Our expected figures for a Stage 1 remap are 653bhp and 852Nm, an expected gain of up to 150bhp and 203Nm.
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 | 503 bhp | 653 bhp | +150 bhp |
| Torque | 649 Nm | 852 Nm | +203 Nm |
All maps at a glance
| Map | Power | Torque | Expected gain, up to |
|---|---|---|---|
| Stock | 503 bhp | 649 Nm | |
| Stage 1Maximum software-only performance | 653 bhp | 852 Nm | +150 bhp +203 Nm |
| Stage 1 EcoPerformance with economy in mind | 616 bhp | 836 Nm | +113 bhp +187 Nm |
| Eco mapEconomy first | 603 bhp | 826 Nm | +100 bhp +177 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 3 Series
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.
This car is listed with a Bosch MG1CS049 engine control 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 3 Series M3 Competition 503bhp?
We expect 653bhp and 852Nm against 503bhp and 649Nm as standard: up to +150bhp and +203Nm. 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 3 Series M3 Competition 503bhp?
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: 616bhp and 836Nm expected. The Eco map is economy first: 603bhp and 826Nm. Both still sit above the standard 503bhp and 649Nm.
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 3 Series figures
Other petrol variants
- M3 Competition 530bhp 2021>
- M3 CS 550bhp 2021>
- M340i 368bhp 2019>
- 330i 254bhp 2019>
- 330e 252bhp 2019>
- 320i 181bhp 2019>
- 318i 156bhp 2019>
All petrol 3 Series (G20) variants · 3 Series (G20) 2019> overview · All BMW figures