Tuning · BMW M4 CS (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.
BMW M4 CS (G82) tuning
The S58 twin-scroll twin-turbo straight-six in the G82 M4 CS is identical in hardware to the standard G82 M4 Competition — same block, same turbos, same MG1 DME. BMW shipped the CS with a sharper factory calibration: 550 bhp / 650 Nm versus 503 / 650 on the standard M4 Competition. BM3, MHD and MG Flasher all have full S58 support on the G82 M4 CS; all three deliver the same Samuel-built calibration: 650 bhp / 800 Nm at Stage 1 on OEM hardware, 720 bhp / 900 Nm at Stage 2 with downpipes, midpipe and intakes. Note: G82 M4 CS cars require a one-time ECU unlock before any map can be flashed.
Engine
S58
Stock
550 bhp · 650 Nm
Stage 3 ceiling
550 bhp
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
£0
About this tune
The G82 M4 CS (2023–present) is the lightweight, sharper-tuned derivative of the G82 M4 Competition — same S58 hardware, more aggressive factory software, stiffer chassis setup and lighter wheels. Coupe only, xDrive only, 8-speed M Steptronic only. The Stage 1 and Stage 2 ceilings are the same as the standard G82 M4 Competition, because the engine hardware is identical; the CS starts from a higher software baseline. Samuel's calibration accounts for the CS chassis stiffness and the xDrive torque-split logic on every file. xHP gearbox calibration is available as an add-on.
Compatibility
This M4 CS (G82) 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 M4 CS (G82) map revision covers: S58 stages explained
The MG1 DME in the G82 M4 CS supports the same flash path and hardware ceiling as every other S58 in the lineup. BM3 and MHD both give good visibility on the S58 platform — important at Stage 2 where torque sits at 900 Nm. Stage 1 targets 650 bhp / 800 Nm on OEM hardware — the same ceiling as the standard M4 Competition Stage 1, reached from a higher 550 bhp starting point. 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, 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.
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
Stage 1 on the G82 M4 CS targets 650 bhp / 800 Nm from the 550 bhp / 650 Nm factory baseline — 100 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 M4 CS (2023–present) — S58 engine, G82 coupe body, xDrive only, M Steptronic only. Every tune Samuel delivers is calibrated for the specific car, its fuel grade and installed hardware. The F82 M4 CS (S55) is a separate page.
A factory warranty can be voided if BMW attributes a specific failure to the tune — that is a personal call. Samuel's M4 CS G82 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 G82 M4 CS without issue.
BM3 is the most widely used on the S58 and the best pick if you want realtime monitoring through the app. MHD covers Stage 1 and Stage 2 with a strong data-logging toolset. MG Flasher is the clean alternative for owners already in that ecosystem. The calibration is the same on all three.
Yes — G82 M4 CS 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.
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