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.
Engine
S58
Stock
503 bhp · 600 Nm (Competition)
Stage 3 ceiling
503 bhp
About this tune
The F98 X4 M (2019-present) is the coupe-SUV variant of the X3 M, same S58 drivetrain, same MG1 DME, in a lower-roofline body with xDrive standard. Stock is 503 bhp / 600 Nm on the Competition (effectively the only spec sold in Europe). The X4 M is the rarer of the two M-division SUVs in the UK; tuning works identically to the X3 M and uses the same Stage 1 / Stage 2 / Stage 2 Flex map family.
BMW X4 M tuning
Choose the F98 X4 M over its X3 M sister and you trade the upright tailgate for a coupé roofline, ending up with the rarer of the two M SUVs on UK roads. Underneath, the full S58 drivetrain is intact, and owners tune the X4 M for the same reason they bought it: it is the left-field choice that gives nothing away mechanically to the M3 and M4.
Samuel takes the X4 M Competition's factory 503 bhp and 600 Nm to 650 bhp and 800 Nm at Stage 1, still on standard hardware, then to 720 bhp and 900 Nm at Stage 2 once downpipes, a midpipe and intakes are fitted. On E50 blends the Flex Fuel option releases up to 800 bhp. Standard xDrive means the sloped-roof body wastes none of it.
A one-off DME unlock comes first, since F98s are locked from the factory, and afterwards the car accepts maps over OBD indefinitely. Serious projects can push the S58 towards 1500 bhp with full turbo conversions and supporting fuel. Samuel works entirely remotely: send your build, receive a hand-calibrated file on BM3, MHD or MG Flasher within 24 hours, and keep the stock file for the day you want factory settings back.
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
Engine guide
BMW X4 M tuning, stages, hardware and what to expect from the F98 S58
The F98 X4 M (2019-present) is the coupe-SUV variant of the X3 M, same S58 drivetrain, same MG1 DME, in a lower-roofline body with the same xDrive system. From the factory, BMW set the X4 M Competition at 503 bhp / 600 Nm; the hardware ceiling sits considerably higher. BMW X4 M tuning with Samuel applies the same S58 Stage 1 / Stage 2 / Stage 2 Flex map family used on the X3 M and M3 / M4, same calibration, same hardware, different body style. BMW X4 M F98 tuning and BMW X4 M Competition tuning use the same map.
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.
Compatibility
Platform and hardware compatibility
Bootmod3 (BM3)
Full S58 support across every chassis in the family (G87 M2, G80 M3, G82 M4, F97 X3 M, F98 X4 M). MG1 DME OBD flashing, realtime monitoring via the BM3 app. The most widely used platform for S58 tuning.
Read more →
MHD
Full S58 support. Suitable for Stage 1, Stage 2 and Stage 2 Flex Fuel. Strong data-logging toolset and active community support.
Read more →
MG Flasher
Full S58 support. Clean interface and reliable flash process on the MG1 DME. A common alternative to BM3 for owners who prefer the MG ecosystem.
Read more →
xHP Flashtool
Compatible with the ZF 8HP gearbox fitted to the S58 family. Gearbox calibration matched to the ECU map, strongly recommended at Stage 2 and above where torque jumps significantly. Available as an add-on.
Read more →
ECU: MG1 DME across every S58 chassis. Accessible via OBD port, no bench flash required for Stage 1, Stage 2 or Stage 2 Flex Fuel.
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 two share every mechanical component that matters, S58, DME, xDrive and gearbox, so the stage structure and targets are identical. What Samuel does not do is hand an X4 M an X3 M's file: each calibration is produced for the specific car from its own details, fuel and hardware.
On Stage 2 hardware with the Flex Fuel option, yes. E50 blends are supported and worth up to 800 bhp thanks to ethanol's octane and charge-cooling benefits. Higher-ethanol running belongs to the hybrid and big-turbo calibrations, where a flex-fuel kit is part of the specified hardware.
As far as any S58 car; the platform supports around 1500 bhp at the top end. The path runs from a hybrid turbo at 800 bhp and up, to a full-frame turbo kit with port injection and flex fuel. Every build past Stage 2 is calibrated individually against the exact parts fitted.
Yes, within sensible limits for a heavy performance SUV. Samuel's calibrations hold conservative boost and temperature targets under sustained load, so the map is not the weak point; brakes and tyres will surrender first. Tell Samuel the car sees circuit use and the file is shaped with that duty cycle in mind.
If BMW ties a failure to the software, a claim can be refused; no honest tuner will say otherwise. What Samuel controls is the margin: X4 M maps are calibrated inside the hardware's proven limits, and restoring the supplied factory file before a dealer visit removes the tune from the car entirely.
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