Tuning · BMW X4 M (F98)
X4 M
S58
The S58 in SUV Coupe 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.
BMW X4 M tuning
Samuel starts with the X4 M's MG1 DME — its specific calibration, your fuel grade, and the hardware sheet you submit. The F98 X4 M runs the same S58 twin-scroll twin-turbo straight-six as the F97 X3 M, G80 M3 and G82 M4 — same MG1 DME, same flash path. Before any map work begins, the ECU unlock is required; after that the car flashes over OBD normally. Stage 1 targets 650 bhp / 800 Nm from the 503 bhp / 600 Nm factory baseline on OEM hardware. Stage 2 is calibrated around downpipes, midpipe and intakes, targeting 720 bhp / 900 Nm. Stage 3 is bespoke, built around the hybrid or big-turbo spec you submit. Every file hand-calibrated for the specific car — coupe-SUV chassis, xDrive torque-split, installed hardware — and reviewed against data logs before sign-off.
Engine
S58
Stock
503 bhp · 600 Nm (Competition)
Stage 3 ceiling
503 bhp
Configurator
Build your X4 M 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
About this tune
The F98 X4 M (2019–present) is the coupe-SUV companion to the F97 X3 M — same S58 powertrain, same MG1 DME, lower roofline and a slightly different aerodynamic and weight distribution profile. Competition spec only in most markets: 503 bhp / 600 Nm, xDrive, 8-speed M Steptronic. Samuel calibrates the F98 X4 M to the same standard as the F97 X3 M and the rest of the S58 family. xHP gearbox calibration is available as an add-on and is strongly recommended at Stage 2 and above.
Compatibility
This X4 M tune runs on Bootmod3, MHD or MG Flasher — all three flash the S58 over OBD. Compare platforms or see full S58 compatibility.
Engine guide
What the X4 M map revision covers: S58 stages explained
The MG1 DME in the F98 X4 M controls boost pressure, torque limits and throttle response — and the factory calibration runs all three conservatively relative to the S58 hardware ceiling. Samuel's calibration revises each of those targets for the specific chassis: the xDrive torque-split logic and the X4's lower roofline chassis behaviour are part of what the file is reviewed against at log-check. Stage 1 targets 650 bhp / 800 Nm from OEM hardware; Stage 2 adds downpipes, midpipe and intakes for 720 bhp / 900 Nm. Add Flex Fuel at Stage 2 for up to 800 bhp on E50 blends. Every map is log-reviewed after the first flash before sign-off.
Stage 1
650 bhp · 800 Nm
No hardware required. The MG1 DME is flashed via the OBD port. BMW X4 M Stage 1 unlocks 650 bhp and 800 Nm from the OEM hardware (up from 503 / 600 stock on the Competition). The BMW X4 M chip tuning starting point, the most cost-effective change you can make to BMW's coupe-SUV M variant.
Every X4 M tune Samuel produces is calibrated individually for the specific car, fuel grade and installed hardware, not a base map loaded and left. BMW X4 M tuning done correctly accounts for the F98 SUV-coupe chassis behaviour, xDrive 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.
X4 M specs & stage targets
BMW X4 M tuning at a glance
- Engine
- S58
- Body styles
- F98 SUV Coupe
- Chassis codes
- F98
- Drivetrain
- Rear-wheel drive
- Gearbox
- 8-speed ZF automatic
- Stock output
- 503 bhp · 600 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
X4 M tuning — frequently asked questions
The calibrated X4 M map is delivered to your BM3, MHD or MG Flasher account within 24 hours of payment confirmation. You flash it over OBD yourself in around 15 minutes — Samuel personally calibrates every file, no automated delivery. The ECU unlock step is coordinated before the first flash.
Yes — the original S58 stock file is supplied before you flash, so the car can return to factory calibration at any time. The ECU unlock is a prerequisite for any map work on the F98 X4 M, but does not affect the tune's reversibility.
A factory warranty can be voided if BMW attributes a specific failure to the tune — that is a personal call. Samuel's X4 M maps are calibrated to stay within the mechanical limits of the S58 hardware, and the tune is fully reversible to stock before any dealer visit. Many owners run a tuned X4 M without issue.
Yes — F98 X4 M 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 car flashes normally over OBD. The unlock is a one-time step and does not affect the tune's reversibility.
Yes. Once you've driven the X4 M on the new map, send your data logs back through your platform (BM3, MHD or MG Flasher), and Samuel reviews them before sign-off. The S58 in the F98 X4 M operates under higher thermal loads than in the lighter G82 M4 chassis — that context is part of the log review on every X4 M job.
Keep exploring
Keep exploring X4 M tuning
Other S58 models we tune: M2, M3, M3 CS (G80), M4, M4 CS (G82), X3 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 X4 M, 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 X4 M ECUs ship locked from the factory and need unlocking before any tune. Here is how it works.
Learn more