N55 · B58 · S55 · S58 · call for a quote
BMW 4 Series and M4 tuning
The 435i, the B58 440i and M440i, and the M4 — S55 F82 and S58 G82 — custom MHD tunes, on our hub dyno or remotely.
Priced per car on a call · in our Corona shop or remote anywhere in the US
The 4 Series shares its engines with the 3 Series of the same year: N55 in the 435i, B58 in the 440i and M440i, S55 in the F82 M4 and S58 in the G82 M4. All of them are MHD platforms.
The M4 is the one we see most — there is one in our shop, and M4s on the hubs are in the videos from our cell.
On our dyno in Corona
Bolted to a Mainline ProHub hub dyno — no tires, no straps — and calibrated against measured power, with the conditions on the sheet. Our hub dyno runs rear-wheel-drive cars. xDrive (all-wheel-drive) BMWs are tuned remotely on MHD, from your logs.
Remote, anywhere in the US
- In MHD, screenshot the DME’s bin number, software version and readiness page, and save the stock .bin file MHD reads from the car.
- Send them to us with what is fitted and the fuel you run. We write the calibration for that car.
- Flash it with MHD. You log, we read the logs and revise until it is right.
What we tune
Models, engines and unlocks
Every car here runs an engine MHD supports. What changes from car to car is what has to happen before the first flash.
| Model | Chassis | Years (US) | Engine | Before the first flash |
|---|---|---|---|---|
| 435i | F32 / F33 / F36 | 2014–2016 | N55 | May need a bench unlock, depending on software |
| 440i | F32 / F33 / F36 | 2017–2020 | B58 | May need a bench unlock, depending on software |
| M4 / Competition / CS / GTS | F82 / F83 | 2015–2020 | S55 | May need a bench unlock, depending on softwareCars built after 06/2020 need a special unlock |
| M440i | G22 / G23 / G26 | 2021– | B58 | Needs a FEMTO or AutoTuner unlock (DME removed) |
| M4 / Competition / CSL | G82 / G83 | 2021– | S58 | Needs a FEMTO or AutoTuner unlock (DME removed) |
Unlock requirements are MHD’s, and they follow when the DME was built, not the model year. MHD’s app has a free Unlock Check that tells you exactly what your car needs.
Before you buy
Questions people ask
- Can you tune a G82 M4?
- Yes. It is an S58 on MHD, and like every current M car it needs a FEMTO or AutoTuner unlock first. Rear-drive cars can be calibrated on our hub dyno; M4 xDrive cars are tuned remotely from logs.
- Can you tune an F82 M4?
- Yes — the S55 is on MHD. Most F82s are earlier than BMW’s 06/2020 cut-off for the special unlock, and MHD’s Unlock Check tells you what yours needs.
- How much does a 4 Series tune cost?
- It is quoted on a call while we finish publishing BMW prices. The figure depends on the engine, what is fitted, the fuel, how many maps you want, and whether the DME needs an unlock first. Call or send the quote form and you get one number before anything is booked.
- Do I need an MHD licence for a custom 4 Series tune?
- Yes. MHD licences are bought per car and held on your MHD account, and a custom tune needs at least the MHD Flasher licence — the map packs are optional. You also need MHD’s wireless adapter. If you do not have either yet, tell us on the call.
- Will a tuned 4 Series pass a California smog check?
- No. Since July 2020 California Smog Check reads the engine software’s calibration ID, and software that is neither BMW’s nor covered by a CARB Executive Order fails. A custom tune is for off-road and competition use, and we will say so before you buy, not after.
Call for a quote
Get a price for your car
BMW prices are quoted per car: engine, parts, fuel, how many maps, and whether the DME needs an unlock first. The fastest way is a call; the form reaches the same calibrators.
(951) 405-4465Mon–Fri 9:00am–6:00pm
A tuned BMW will not pass a California smog check, and adding power costs longevity and economy. We say so before you buy. Emissions disclaimer