Tuning · BMW M4 CS (G82) (G82)
M4 CS (G82)
S58
The CS treatment for the G82 M4, sharper factory map, stiffer chassis setup, M-DCT and xDrive standard. Hand-calibrated from Stage 1 to a fully bespoke big-turbo build. Same S58 hardware as the standard G82 M4 Competition, with a 550 bhp / 650 Nm factory starting point instead of 503 / 650.
Engine
S58
Stock
550 bhp · 650 Nm
Stage 3 ceiling
550 bhp
About this tune
The G82 M4 CS (2023-present) is the lightweight, more aggressive derivative of the G82 M4 Competition, same S58 twin-scroll twin-turbo straight-six, with a sharper factory map (550 bhp / 650 Nm vs 503 / 650 on the standard Competition). Coupe only, xDrive only, M-DCT only. The CS treatment includes lighter wheels, a stiffer chassis setup and an aggressive factory throttle calibration, and it tunes identically to every other S58 car from a hardware ceiling standpoint.
BMW M4 CS (G82) tuning
The M4 CS sits at the top of the G82 range: 550 bhp out of the crate, xDrive and the 8-speed auto fixed, weight trimmed and the chassis tightened. What it did not get was different engine internals, and that is the opportunity, because an M4 CS carries the same turbos and fuel system as every other S58 car, so the tuning ceiling sits exactly where it does for the standard Competition.
Samuel's Stage 1 for the M4 CS turns 550 bhp and 650 Nm into 650 bhp and 800 Nm, restoring the gap the CS premium never bought under the bonnet. With downpipes, a midpipe and intakes, Stage 2 delivers 720 bhp and 900 Nm, and E50 blends through the Flex Fuel option raise that towards 800 bhp. Every file is calibrated to the individual car rather than scaled from a standard M4 map.
Owners who keep going can take the platform to around 1500 bhp on hybrid or full-frame turbo hardware, calibrated bespoke against the full parts list. The CS's locked DME is opened once at the start, after which it behaves like any tunable BMW. Delivery is entirely remote: a hand-built file on BM3, MHD or MG Flasher inside 24 hours, with the factory CS calibration kept safe for a complete return to stock.
Configurator
Build your M4 CS (G82) 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
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Engine guide
BMW M4 CS (G82) tuning, stages, hardware and what to expect from the S58
The G82 M4 CS runs the S58, same twin-scroll twin-turbo straight-six as the standard G82 M4 Competition and the G80 M3 / M3 CS. BMW set the M4 CS at 550 bhp / 650 Nm versus 503 / 650 on the standard M4 Competition. The engine, turbos, fuelling and DME are identical between the cars; the CS adds a sharper factory map, a stiffer chassis setup and lighter wheels. BMW M4 CS G82 tuning with Samuel uses the same map ethos as the standard M4 Competition, the CS just starts from a higher baseline, so the Stage 1 / Stage 2 ceilings sit at the same final figure.
Stage 1
650 bhp · 800 Nm
No hardware required. The MG1 DME is flashed via the OBD port, boost pressure, ignition timing, fuel delivery and torque limiters all revised. BMW M4 CS Stage 1 unlocks 650 bhp / 800 Nm from the OEM hardware (up from 550 / 650 stock). Same Stage 1 ceiling as the standard G82 M4, the hardware is identical between the two trim levels.
Every M4 CS tune Samuel produces is calibrated individually for the specific car, fuel grade and installed hardware, not a base map loaded and left. BMW M4 CS G82 tuning done correctly accounts for the CS chassis stiffness, the M-DCT calibration 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 including the M4 CS. MG1 DME OBD flashing, realtime monitoring, and licence management via the BM3 app. The most widely used platform for G82 M4 CS tuning.
Read more →
MHD
Full S58 support. Suitable for Stage 1 and Stage 2 on the M4 CS. Strong data-logging toolset.
Read more →
MG Flasher
Full S58 support. Clean interface and reliable flash process on the MG1 DME.
Read more →
xHP Flashtool
Compatible with the 8-speed M-DCT on the G82 M4 CS. Strongly recommended at Stage 2, available as an add-on. The CS chassis is xDrive-only, so the gearbox calibration is matched to the AWD logic.
Read more →
ECU: MG1 DME. Accessible via OBD port, no bench flash required for Stage 1, Stage 2 or Stage 2 Flex Fuel.
M4 CS (G82) specs & stage targets
BMW M4 CS (G82) tuning at a glance
- Engine
- S58
- Body styles
- G82 Coupe
- Chassis codes
- G82
- Production
- 2021–present
- Drivetrain
- M xDrive
- Gearbox
- 8-speed M Steptronic
- Stock output
- 550 bhp · 650 Nm
- 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 CS (G82) tuning — frequently asked questions
Mostly the starting point. The CS opens at 550 bhp where the Competition opens at 503, but both cars share identical turbos, fuelling and internals, so Stage 1 and Stage 2 finish at the same figures. Samuel's CS calibration works with the more aggressive factory throttle and boost character instead of flattening it.
The same trio as the rest of the S58 range: downpipes, a midpipe and intakes. That combination lets the standard turbos hold 720 bhp and 900 Nm to redline, and it is the prerequisite for the Flex Fuel option, which uses E50 blends to reach as much as 800 bhp.
It works in the car's favour. M xDrive puts 800 Nm to the road with almost no drama, and the 8-speed M Steptronic tolerates the raised torque well at these stages. There is no manual or rear-drive variant to account for, so every CS file is built around one known, consistent driveline.
It can, if BMW links a specific failure to the map; that is true of any tuned car and worth weighing on a limited-production model. Samuel calibrates within the S58's mechanical limits rather than at them, and the CS can be flashed back to its supplied factory file before any dealer inspection.
Around 1500 bhp, the same ceiling as the whole S58 family, reached with a full-frame turbo kit, port injection and flex fuel. A hybrid turbo sits in between, from 800 bhp upwards. These are bespoke calibrations quoted against your complete specification, so share the entire parts list with Samuel before committing.
Keep exploring
Keep exploring M4 CS (G82) tuning
Other S58 models we tune: M2, M3, M3 CS (G80), M4, 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 CS (G82), 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 CS (G82) ECUs ship locked from the factory and need unlocking before any tune. Here is how it works.
Learn more