Tuning · BMW M3 (G80 / G81)
M3
S58
The S58 in M3 saloon and Touring form. Hand-calibrated from Stage 1 to a fully bespoke big-turbo build. Choose your package, send your build to Samuel, and get a tune that fits the way you actually drive.
Engine
S58
Stock
503 bhp · 650 Nm (Competition)
Stage 3 ceiling
503 bhp
About this tune
The G80 M3 (2021-present) is the first generation to offer xDrive alongside the traditional RWD layout, both variants run the same S58 and respond identically to tuning. Competition and standard models share the same base map with different software limiters; Samuel's calibration addresses both. Available as the G80 Saloon and G81 Touring, with the Competition xDrive being the most popular variant in the UK. Whether you are after G80 M3 Competition tuning or planning a parts-led build, every package here is a hand-built S58 calibration on BM3, MHD or MG Flasher rather than a generic off-the-shelf map.
BMW M3 tuning
The BMW M3 (G80 / G81, 2021–present) leaves the factory at 503 bhp · 650 Nm (Competition). Stage 1 moves that to 650 bhp · 800 Nm without touching any hardware — Samuel maps the MG1 DME via OBD on BM3, MHD or MG Flasher, every file calibrated to the specific car and its fuel grade. Stage 2 targets 720 bhp · 900 Nm with downpipes, midpipe and intakes; from there the S58 runs to around 1500 bhp on a hybrid or big-turbo build. Every map is delivered to your flashing tool account within 24 hours and is fully reversible to the supplied stock file.
The G80 M3 (2021–present) is the first M3 generation to offer M xDrive alongside the traditional RWD layout — both variants run the same S58 and respond identically to tuning. Competition and standard models share the same base engine; Samuel's calibration is built around your specific car, fuel grade and installed hardware, not pulled from a generic file. Available as the G80 Saloon and G81 Touring, with xDrive Competition being the most common spec in the UK.
Configurator
Build your M3 tune
Choose your stage — Stage 1, Stage 2 or Stage 3 — add the options that fit your car, and send the full build to Samuel for a custom remote remap. He'll quote, schedule, and personally calibrate within 24 hours of confirmation.
Add a stage or add-on
£0
Engine guide
S58 engine tuning, stages, hardware and what to expect
The S58 is BMW M's highest-output straight-six to date, fitted to the G80 M3, G82 M4, G87 M2, F97 X3 M and F98 X4 M. From the factory, BMW M leaves meaningful headroom in the calibration, the engine, twin-scroll turbos and drivetrain are all capable of significantly more than the production figures suggest. BMW M3 G80 tuning with Samuel starts with understanding exactly where that headroom sits, then building a map that extracts it reliably across the full operating range.
Stage 1
650 bhp · 800 Nm
No hardware required. The ECU map is revised via OBD port access, boost pressure, ignition timing, fuel delivery and torque limiters are all adjusted. On the M3 Competition the result is 650 bhp and 800 Nm (up from 503 bhp / 650 Nm stock), with a torque curve that feels substantially more accessible through the mid-range. The most cost-effective single modification available on the G80 M3.
Every tune Samuel produces is calibrated individually for the specific car, fuel grade and installed hardware, not a base map loaded and left. Tuning a BMW M3 G80 correctly means accounting for real-world variables: ambient conditions, the car's service history, and what the owner actually wants from it. The process includes a data log review after the initial flash, with revisions made before the tune is signed off.
Compatibility
This M3 tune runs on Bootmod3, MHD or MG Flasher — all three flash the S58 over OBD. Compare platforms or see full S58 compatibility.
M3 specs & stage targets
BMW M3 tuning at a glance
- Engine
- S58
- Body styles
- G80 Saloon · G81 Touring
- Chassis codes
- G80 / G81
- Production
- 2021–present
- Drivetrain
- RWD or M xDrive
- Gearbox
- 8-speed M Steptronic or 6-speed manual
- Stock output
- 503 bhp · 650 Nm (Competition)
- Tuning ceiling
- ~1500 bhp on the right hardware
| Stage | Target |
|---|---|
| Stage 1 | 650 bhp · 800 Nm |
| Stage 2 | 720 bhp · 900 Nm |
| Stage 3, Hybrid Turbo | 800-1500 bhp depending on spec |
| Stage 3, Big Turbo Kit | 800-1500 bhp depending on spec |
FAQ
M3 tuning — frequently asked questions
M3 Stage 1 lifts the S58 from 503 bhp · 650 Nm (Competition) to 650 bhp · 800 Nm — no hardware required. The map is flashed through the OBD port on BM3, MHD or MG Flasher and puts noticeably more torque through the mid-range, with a much sharper top-end than stock.
Stage 2 on the M3 targets 720 bhp · 900 Nm and needs downpipes, midpipe and intakes. Turbo, fuel system and intercooler all hold within the Stage 2 figures on the S58 — no further hardware required to hit that number.
Samuel personally calibrates the M3 map and delivers it to your BM3, MHD or MG Flasher account within 24 hours of payment — no automated delivery. You flash it yourself over OBD in around 15 minutes.
Yes — the original S58 stock file is supplied before you flash, so the M3 can return to factory calibration at any time.
The 8-speed ZF in the M3 benefits from xHP calibration once torque climbs — at Stage 2 and above it's strongly recommended for firmer, faster shifts and higher torque limits matched to the ECU map. At Stage 1 it's optional but noticeable. Manual-gearbox M3s don't need it. Available as an add-on on this page.
Keep exploring
Keep exploring M3 tuning
Other S58 models we tune: M2, M3 CS (G80), M4, M4 CS (G82), X3 M, X4 M.
Engine guide
S58 tuning
Every S58 BMW we calibrate, with the full Stage 1, 2 and 3 breakdown for the engine.
Learn moreStages
Stage 1 & Stage 2 explained
What separates Stage 1 from Stage 2 on the M3, the real-world gains and the hardware each one needs.
Learn morePricing
How tuning is priced
How the licence, off-the-shelf maps and custom calibration are priced. We quote your exact spec, never a fixed menu.
Learn moreGuide
What is bootmod3?
New to remote flashing? A plain-English explainer on the platform and how a custom map reaches your car.
Learn moreBefore you flash
ECU unlock guide
Newer M3 ECUs ship locked from the factory and need unlocking before any tune. Here is how it works.
Learn more