Your Vehicle
BMW M3 M3 343hp
Technical Specifications
Power and torque increase
Stage 1: software remap only, no mechanical changes, fully reversible. Stage 2: remap combined with downpipe / sports air filter.
Power HP
Torque Nm
Book your Stage 1 remap
499 € VAT included · pay online, the work is done at the workshop you choose
Power Graph · Stage 1
BMW M3 M3 343hp: da 343 a 365HP
Values for Stage 1 (change the stage from the control above)
Remapping BMW M3
MasterTuning is a leader in developing remapping for BMW. La BMW M3 M3 343hp può passare da 343 HP a 365 HP con un incremento di 22 HP.
The development of each remap is customized by MasterTuning.
- 100% tested and customized files guarantee
- Tested and developed on a 4x4 dyno
- Best performance, within safety margins
- Reduced fuel consumption
ECU Remapping Details BMW M3 M3 343hp
The BMW M3 M3 343hp is equipped with a petrol engine that produces 343 HP and 365 Nm of torque in its factory configuration. With MasterTuning's professional ECU remapping, this BMW can achieve 365 HP (+6%) and 390 Nm (+7%).
Our Stage 1 tuning for the M3 E46 - 1998 - 2005 delivers an impressive gain of +22 HP and +25 Nm, optimizing the petrol engine's performance while maintaining reliability and staying within safe parameters.
The engine code 326S4 identifies this specific powerplant configuration. The Siemens/Continental MSS52 / Siemens/Continental MSS54 ECU is professionally recalibrated to unlock hidden potential while preserving engine longevity.
With 343 HP from factory, this BMW M3 is already a performance vehicle. Our remapping extracts even more potential, delivering exhilarating acceleration and enhanced driving dynamics for enthusiasts who demand the best.
Technical Specifications — BMW M3 M3 343hp
Factory technical data for the BMW M3 M3 343hp (E46 - 1998 - 2005), used by MasterTuning engineers to develop a tailored, dyno-tested remap for this specific powerplant.
| Engine code | 326S4 |
|---|---|
| ECU / Control unit | Siemens/Continental MSS52 / Siemens/Continental MSS54 |
| Fuel | Petrol |
| Compression ratio | 11.5 |
| Bore × stroke | 87.0 X 91.0 mm |
| Stock power | 343 HP · 365 Nm |
| Remapped power (Stage 1) | 365 HP (+22) · 390 Nm (+25) |
Don't want to touch the ECU?
Rapid Dimsport add-on modules connect to the engine sensors with original connectors: they fit in a few hours and come off without a trace, leaving the factory software untouched. Useful on a leased car, one still under warranty or one you plan to sell soon. Check which ones fit your BMW M3.
Frequently Asked Questions - BMW M3
How much power can I gain from remapping my BMW M3?
With MasterTuning Stage 1, your BMW M3 M3 343hp can gain +22 HP (from 343 to 365 HP) and +25 Nm of torque. This represents a 6% increase in power.
Is ECU remapping safe for the BMW M3 engine?
Yes, MasterTuning's remapping for the BMW M3 M3 343hp is developed within safe parameters. All calibrations are tested on our 4x4 dyno and stay within the mechanical limits of the 326S4 engine.
Is the BMW ECU remapping reversible?
Absolutely. The original factory calibration of your BMW M3 is always backed up before remapping. The process is 100% reversible at any time.
Will remapping affect my BMW warranty?
ECU remapping may affect your manufacturer warranty. We recommend checking your specific warranty terms. Many of our customers choose to remap after the warranty period or accept this trade-off for the significant performance gains.
Other Remaps You Might Like
Other Engines BMW M3 E46 - 1998 - 2005
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Book your remap or ask for a quote
Stage 1 can be bought online and is done at the workshop you choose; for Stage 2 we send you a quote.
Stage 2 is quoted on request: write to us and we will reply with price and timing.
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