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) runs the S58 and leaves the factory at 503 bhp · 650 Nm (Competition), RWD or M xDrive, 8-speed M Steptronic or 6-speed manual. Samuel tunes the G80 Saloon and G81 Touring to the same standard — every map hand-calibrated for the specific car, its fuel grade and its installed hardware, not a base file loaded and left. M3 Stage 1 alone takes it from 503 bhp · 650 Nm (Competition) to 650 bhp · 800 Nm on the standard turbo, flashed over OBD on BM3, MHD or MG Flasher.
Add the Stage 2 hardware and the M3 targets 720 bhp · 900 Nm; from there the S58 stretches to around 1500 bhp on a hybrid or big-turbo build with supporting fuelling. Whichever stage suits the M3, the file is delivered within 24 hours and is fully reversible to the supplied stock calibration.
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
Platform and hardware compatibility
Bootmod3 (BM3)
Full S58 support. The most widely used platform for BMW M3 G80 tuning. MG1 DME OBD flashing, realtime monitoring, and licence management via the BM3 app.
Read more →
MHD
Full S58 support. Suitable for Stage 1 and Stage 2 on the G80 M3. Strong data-logging toolset and active community support.
Read more →
MG Flasher
Full S58 support. Preferred by many users for its clean interface and reliable flash process on the MG1 DME.
Read more →
xHP Flashtool
Compatible with the 8-speed ZF gearbox on xDrive and manual-delete RWD variants. Gearbox tuning matched to the ECU calibration, available as an add-on.
Read more →
ECU: MG1 DME. Accessible via OBD port, no bench flash required for Stage 1 or Stage 2.
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 a stock 503 bhp · 650 Nm (Competition) to 650 bhp · 800 Nm, with no hardware required. The map is flashed through the OBD port on BM3, MHD or MG Flasher and is the starting point for almost every M3 owner — broader torque and sharper throttle response from the factory hardware.
This page covers the G80 Saloon and G81 Touring (G80 / G81). They share the S58 engine and run the same core calibration, but every M3 tune Samuel delivers is tailored to your exact car, fuel grade and installed hardware — never a base map loaded and left.
Stage 2 on the M3 targets 720 bhp · 900 Nm and needs downpipes + midpipe + intakes. Everything else — turbo, fuel system, intercooler — holds within the Stage 2 figures on the S58.
On the right hardware spec the S58 in the M3 reaches around 1500 bhp. Stage 1 and Stage 2 run the standard turbo; beyond that needs a hybrid or full big-turbo conversion with supporting fuelling, and the calibration is built bespoke per car.
Yes — later M3 (G80 / G81) cars ship with a locked DME that must be unlocked once before any map can be written. It's a one-time step; after that the M3 flashes normally over OBD and the tune is fully reversible to the supplied stock file.
Remotely. Once Samuel has your build details, the calibrated M3 map is delivered to your flashing tool account (BM3, MHD or MG Flasher) within 24 hours and you flash it yourself over OBD in about 15 minutes. It's fully reversible — the original S58 stock file is supplied before you flash, so the car can return to factory at any time.
A factory warranty can be voided if BMW shows a tune caused a specific failure, so it's a personal call. Samuel's M3 maps are calibrated to stay within the mechanical limits of the S58 hardware, and because the tune is reversible to stock before any dealer visit, many owners run a tuned M3 without issue.
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