Tuning · BMW M3 (G80 / G81)
M3
S58
The S58 in M3 saloon and Touring 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 G80 M3 (2021-present) is the first generation to offer xDrive alongside the traditional RWD layout, both variants run the same S58 and respond identically to tuning. Competition and standard models share the same base map with different software limiters; Samuel's calibration addresses both. Available as the G80 Saloon and G81 Touring, with the Competition xDrive being the most popular variant in the UK. Whether you are after G80 M3 Competition tuning or planning a parts-led build, every package here is a hand-built S58 calibration on BM3, MHD or MG Flasher rather than a generic off-the-shelf map.
BMW M3 tuning
Five doors or four, the G80 generation is the M3 at its most usable: the G80 saloon carries the badge's benchmark status while the G81 gives the UK its first-ever M3 Touring. Owners tune them for a simple reason, the Competition's 503 bhp is a software figure rather than a hardware one, and the first generation of M3 with xDrive finally has the traction to exploit what the S58 can actually deliver.
From the Competition's 503 bhp and 650 Nm, Samuel's Stage 1 raises the M3 to 650 bhp and 800 Nm on entirely stock hardware. Stage 2 adds downpipes, a midpipe and intakes to reach 720 bhp and 900 Nm, with a Flex Fuel option taking E50 blends as far as 800 bhp. Standard and Competition cars share a base map separated by software limiters, and Samuel calibrates for both, matched to your fuel and fitted parts.
The G80 and G81 both carry a locked DME from the factory, unlocked once before the first map goes on and never touched again. Committed builds carry the S58 towards 1500 bhp with hybrid or full-frame turbos and supporting fuelling. Everything happens remotely: your calibration arrives on BM3, MHD or MG Flasher inside 24 hours, and reverting to the stock file takes one flash.
Configurator
Build your M3 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
S58 engine tuning, stages, hardware and what to expect
The S58 is BMW M's highest-output straight-six to date, fitted to the G80 M3, G82 M4, G87 M2, F97 X3 M and F98 X4 M. From the factory, BMW M leaves meaningful headroom in the calibration, the engine, twin-scroll turbos and drivetrain are all capable of significantly more than the production figures suggest. BMW M3 G80 tuning with Samuel starts with understanding exactly where that headroom sits, then building a map that extracts it reliably across the full operating range.
Stage 1
650 bhp · 800 Nm
No hardware required. The ECU map is revised via OBD port access, boost pressure, ignition timing, fuel delivery and torque limiters are all adjusted. On the M3 Competition the result is 650 bhp and 800 Nm (up from 503 bhp / 650 Nm stock), with a torque curve that feels substantially more accessible through the mid-range. The most cost-effective single modification available on the G80 M3.
Every tune Samuel produces is calibrated individually for the specific car, fuel grade and installed hardware, not a base map loaded and left. Tuning a BMW M3 G80 correctly means accounting for real-world variables: ambient conditions, the car's service history, and what the owner actually wants from it. The process includes a data log review after the initial flash, with revisions made before the tune is signed off.
Compatibility
Platform and hardware compatibility
Bootmod3 (BM3)
Full S58 support. The most widely used platform for BMW M3 G80 tuning. MG1 DME OBD flashing, realtime monitoring, and licence management via the BM3 app.
Read more →
MHD
Full S58 support. Suitable for Stage 1 and Stage 2 on the G80 M3. Strong data-logging toolset and active community support.
Read more →
MG Flasher
Full S58 support. Preferred by many users for its clean interface and reliable flash process on the MG1 DME.
Read more →
xHP Flashtool
Compatible with the 8-speed ZF gearbox on xDrive and manual-delete RWD variants. Gearbox tuning matched to the ECU calibration, available as an add-on.
Read more →
ECU: MG1 DME. Accessible via OBD port, no bench flash required for Stage 1 or Stage 2.
M3 specs & stage targets
BMW M3 tuning at a glance
- Engine
- S58
- Body styles
- G80 Saloon · G81 Touring
- Chassis codes
- G80 / G81
- 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
M3 tuning — frequently asked questions
Stage 1 takes the Competition from 503 bhp and 650 Nm to 650 bhp and 800 Nm, nearly 150 bhp from calibration alone with no parts fitted. The stock turbos, fuelling and intercooling all operate within their limits at this level, which is why it remains the most popular starting point for G80 owners.
Mechanically the Touring is identical to the saloon, same S58, same DME, same drivetrain options, so the stage targets carry straight across. Samuel still calibrates each car individually against its own fuel, hardware list and use, so a Touring file is built for that Touring rather than copied from a saloon.
Downpipes, a midpipe and intakes. With the exhaust side freed up the standard turbos support 720 bhp and 900 Nm, and adding the Flex Fuel option on E50 blends opens up to 800 bhp. Nothing else needs changing at this stage, as the factory fuel system and intercooling cope with the Stage 2 targets.
Both take the same maps, but they use the power differently. An xDrive car puts the full 800 Nm down almost anywhere, which is part of why the Competition xDrive is the UK's most popular spec; a RWD car demands more from its driver and its tyres. Samuel adjusts torque delivery by gear to suit whichever layout you run.
BMW can reject a claim if it proves a tune contributed to a specific failure, so the risk sits with the owner. Samuel keeps every M3 calibration inside the mechanical tolerances of the S58 and its driveline, and because the car flashes back to the supplied stock file before a dealer visit, the map itself is removable in minutes.
Keep exploring
Keep exploring M3 tuning
Other S58 models we tune: M2, M3 CS (G80), M4, 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 M3, 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 M3 ECUs ship locked from the factory and need unlocking before any tune. Here is how it works.
Learn more