Tuning · BMW M4 (G82 / G83)
M4
S58
The S58 in M4 coupe and convertible 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 G82 / G83 M4 (2021-present) is the coupe and convertible companion to the G80 M3, same S58 twin-scroll twin-turbo straight-six, same MG1 DME, same 8HP gearbox. Stock is 503 bhp / 650 Nm on the Competition (which accounts for almost the entire UK market). Available as the G82 coupe and G83 convertible, with Competition xDrive and Competition RWD options. The M4 Competition is one of the most-tuned modern M cars in the UK; the S58 underneath has substantial headroom from factory.
BMW M4 tuning
The S58 twin-scroll twin-turbo straight-six in the G82 M4 and G83 M4 Convertible is the same engine fitted to the G80 M3, G87 M2 and F97 / F98 X3 M / X4 M — same MG1 DME, same hardware ceiling. The Competition spec is essentially the entire UK market: 503 bhp / 650 Nm from the factory, with meaningful headroom left in the software. Samuel calibrates the same Stage 1 / Stage 2 map across G82 coupe, G83 convertible, Competition xDrive and Competition RWD — the engine and ECU are identical between those variants, the chassis balance differs. Stage 1 reaches 650 bhp / 800 Nm from factory hardware; Stage 2 adds downpipes, midpipe and intakes for 720 bhp / 900 Nm. Note: G82 / G83 M4 cars require a one-time ECU unlock before any map can be flashed.
The G82 / G83 M4 (2021–present) is the coupe and convertible companion to the G80 M3 — same S58 powertrain, same MG1 DME, available with Competition xDrive (standard UK spec) or Competition RWD (special order in most markets), and the 8-speed M Steptronic or 6-speed manual. The G82 coupe and G83 convertible share the same core calibration; the xDrive and RWD drivetrain variants also share the same ECU map. Samuel tunes all four variants to the same standard. xHP gearbox calibration is available as an add-on for automatic cars, matched to the revised ECU output.
Configurator
Build your M4 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
What the M4 map revision covers: S58 stages explained
The S58 in the G82 M4 is shared hardware with the G80 M3 and G87 M2, but the M4 chassis — coupe or convertible, xDrive or RWD — affects how the torque lands. Samuel's calibration accounts for the specific variant: the xDrive torque split logic on four-wheel-drive cars, and the RWD delivery ramp on two-wheel-drive cars, are part of what the file is reviewed against at log-check. Stage 1 targets 650 bhp / 800 Nm on factory hardware; Stage 2 adds downpipes, midpipe and intakes for 720 bhp / 900 Nm — the stock turbos at their real ceiling. Add Flex Fuel at Stage 2 for up to 800 bhp on E50 blends.
Stage 1
650 bhp · 800 Nm
No hardware required. The MG1 DME is flashed via the OBD port, boost, ignition timing, fuel delivery and torque limiters all revised. BMW M4 Stage 1 unlocks 650 bhp and 800 Nm from the OEM hardware (up from 503 / 650 stock on the Competition). The BMW M4 chip tuning starting point, and the largest single performance step you can take on a Competition without touching exhaust hardware.
Every M4 tune Samuel produces is calibrated individually for the specific car, fuel grade and installed hardware, not a base map loaded and left. BMW M4 tuning done correctly accounts for the G82 / G83 chassis behaviour, the xDrive or RWD drivetrain calibration, the 8HP gearbox, and UK fuel quality; the map is reviewed against your data logs after the first flash and revised before sign-off.
Compatibility
This M4 tune runs on Bootmod3, MHD or MG Flasher — all three flash the S58 over OBD. Compare platforms or see full S58 compatibility.
M4 specs & stage targets
BMW M4 tuning at a glance
- Engine
- S58
- Body styles
- G82 Coupe · G83 Convertible
- Chassis codes
- G82 / G83
- 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
M4 tuning — frequently asked questions
Stage 1 on the M4 Competition (G82/G83) targets 650 bhp / 800 Nm from the 503 bhp / 650 Nm factory baseline — 147 bhp / 150 Nm gained from the OEM S58 hardware. The MG1 DME is flashed via the OBD port on BM3, MHD or MG Flasher in around 15 minutes.
This page covers the G82 Coupe and G83 Convertible (2021–present) in both Competition xDrive and Competition RWD variants. The engine, MG1 DME and stage targets are the same across all four permutations. Every tune Samuel delivers is calibrated for the specific car, its fuel grade and installed hardware.
Stage 2 on the G82/G83 M4 targets 720 bhp / 900 Nm and needs downpipes + midpipe + intakes. The stock S58 turbos hold within the Stage 2 figures with the expanded airflow from those three items; beyond that moves to Stage 3 territory.
Yes — G82/G83 M4 cars ship with a locked MG1 DME from the factory. The ECU must be unlocked once before any map can be written; after that the M4 flashes normally over OBD. The unlock is a one-time step and does not affect the tune's reversibility.
The S58 in the G82/G83 M4 reaches around 1500 bhp on the right hardware spec. Stage 1 and Stage 2 run the stock turbos; beyond that needs a hybrid or full big-turbo conversion with supporting fuelling, and every Stage 3 calibration is built bespoke per car.
Keep exploring
Keep exploring M4 tuning
Other S58 models we tune: M2, M3, M3 CS (G80), 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 M4, 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 M4 ECUs ship locked from the factory and need unlocking before any tune. Here is how it works.
Learn more