Bring your BMW.
Book your visit and confirm vehicle compatibility and the work with us. İnönü Mahallesi, Düzenli Sokak No:3/A, Ataşehir / Istanbul.
BMW G22 / G26 420i tuning — Ataşehir, Istanbul
4 Series Coupé and Gran Coupé: we provide engine tuning, unlock and gearbox tuning at MOSTUNED for compatible vehicles with the 1.6 B48B16 engine and MG1CS003 ECU. The model badge alone does not establish compatibility: engine, ECU and current software must be checked together.
BMW tuning at our Ataşehir workshop.
MOSTUNED provides BMW engine tuning, ECU unlock and gearbox tuning in Ataşehir, Istanbul. We also develop our own iOS app.
300 HP workshop package
For compatible 1.6 B48B16 / MG1CS003 vehicles: unlock, engine tuning and Stage 2 gearbox tuning for €750. Plan your visit.
Stay in control afterwards.
Use the app with a compatible vehicle, an authorised VIN, the appropriate package and connection hardware. Compare workshop services with online Flash licences before purchasing.
What does the €750 package include?
Workshop service: ECU unlock, 300 HP engine tuning and Stage 2 gearbox tuning for a compatible vehicle. Total application takes approximately 30 minutes once compatibility is confirmed; vehicle condition and any additional work can affect timing.
Burble intensity and RPM range can be adjusted in the app, with burble active only in Sport mode. Sport Cooling on/off, Cold Start suppression and an optional RPM limiter depend on vehicle and package compatibility.
300 HP identifies the package level, not a guaranteed measured result for every vehicle. Actual power depends on condition, fuel and hardware. The power comparison below is not a customer vehicle dyno measurement.
Why is the 420i 1.6L in Turkey?
In Turkey the entry 4 Series uses — for tax-bracket reasons — not the 2.0 but the 1.6L B48B16 (MG1CS003 ECU), the identical unit found in the 320i and 520i.
So the calibration is the same as the 320i: stock 170 PS to 280 and 300 HP by software alone, 320 HP with a downpipe and suitable fuel.
The G22 Coupé and G26 Gran Coupé differ in weight/aero; the engine and calibration are the same. Full output shows on a well-maintained car.
What does the software feel like on a 420i?
The Turkish-market 420i looks like a 4 Series but shares the 3 Series entry drivetrain: 170 PS and the 8-speed automatic. The coupé body is a little heavier than the 320i, and in factory trim that shows as a "waiting for boost" feel between 1,500 and 2,500 rpm. That is the first thing the calibration addresses: torque request and boost curve are brought forward, so the car pulls on overtakes and hills without dropping a gear.
The 280 and 300 HP stages run with the stock downpipe and stock OPF; you open up the exhaust sound with the crackle setting as much as you like. 320 HP needs a downpipe — the same downpipe fits the Gran Coupé (G26) and Coupé (G22), and OPF/DP calibration is included.
A question we get often: "Is the 420i M Sport different?" No — the trim changes looks and suspension, the engine and ECU stay the same. Stages and prices are identical to the 320i.
Power by stage
Factory output 170 PS. Figures in metric horsepower (PS).
280 and 300 on stock hardware; 320 needs a downpipe and suitable fuel. The stage is chosen from datalog data. Package-level comparison; not measured dyno results.
Packages and power stages
280 and 300 are delivered on stock hardware, software only. 320 needs a downpipe and fuel support — turbo and injectors stay stock on all three.
| Package | Power | Hardware | Gain |
|---|---|---|---|
| Stock | 170 HP | factory | — |
| 280 HP Package | 280 HP | stock hardware | +110 HP |
| 300 HP Package | 300 HP | stock hardware | +130 HP |
| 320 HP Package | 320 HP | downpipe + fuel | +150 HP |
Figures are metric horsepower (PS) as used in Turkey; the UK bhp equivalent is slightly lower (170 PS = 168 bhp). 320 is not delivered on stock hardware — a downpipe must be fitted and the fuel must suit it; that is Stage 2 territory. Which stage suits your car depends on fuel quality, maintenance and what we see in a road log — datalog analysis exists for exactly that.
Included features
Alongside the power stage, toggles you control from the app. For track / closed-road use; road legality is the user's responsibility.
Crackle / Pops (adjustable)
Controlled crackle and pops from the exhaust. Rev range, speed and intensity are set from the app.
Cold Start Delete
Silences the high-idle, noisy warm-up on cold starts. Quiet mornings — fully off or off once warm.
Speed Limiter Off
Removes the factory electronic speed limit (Vmax).
RPM Limiter
Adjusts the rev limit to suit your stage.
OPF / DP Calibration
Compatible calibration for particulate-filter delete or downpipe cars.
Sport Cooling
Earlier, more aggressive cooling for high load and track use.
Flash licences for the app
The products below are licences used through the app. Book a visit for the €750 workshop package including unlock and Stage 2 gearbox tuning.
Flasher
€350
- Write your own or your tuner's file
- Crackle, OPF/DP, Vmax, cold start, RPM included
- Original backup + return to stock
- No ready HP maps included
Flasher + 280/300 HP
€750
- Flasher + 280 and 300 HP ready maps
- Stock hardware, software only
- All features (crackle, OPF, Vmax…)
- Original backup + return to stock
Full: Flasher + 280/300 + 320
€900
- Flasher + all three stages
- 320 needs downpipe + suitable fuel
- €150 cheaper than buying one by one
- Original backup + return to stock
Already own the Flasher? 280/300 HP package €500, 320 HP add-on €200, both together €700. Pick your car and situation on Find my package to see the right price. You can check your car's eligibility for free from the app before buying.
You pick the package in the app
You choose the stage and the extra toggles on the app's Flash screen. The package card shows the stages authorised for your VIN — without access, the option does not open.
Exhaust sound (crackle), speed limiter and cold-start behaviour are separate switches; which ones suit your car we decide together.
Once the write starts, progress and a log of every step scroll on screen. You do not need to leave the app before it finishes.
420i FAQ
Where is the work carried out?
At MOSTUNED, İnönü Mahallesi, Düzenli Sokak No:3/A, Ataşehir, Istanbul. Monday–Saturday 09:00–18:00; arrange an appointment before visiting.
Does the €750 price include gearbox tuning?
The workshop package described here includes unlock, engine tuning and Stage 2 gearbox tuning for compatible vehicles. Online Flash licence coverage is specified on the respective product pages.
Is the 420i really 1.6L?
Yes. The Turkish 420i ships with the 1.6L B48B16 — same engine as the 320i. Badge 420, engine 1,597 cc.
Are both G22 and G26 supported?
Yes, both the Coupé (G22) and Gran Coupé (G26). Same engine, same packages.
Same file as the 320i?
Same engine family (B48B16 / MG1CS003), so the stages are the same; every write is prepared for your VIN.
Refunds?
No refunds once delivered; see terms of use.
Related
- BMW B48 tuning — the 1.6 B48 engine
- BMW 520i chip tuning — same engine, 5 Series
- See packages — 280 / 300 / 320 HP pricing
Feedback from a G22 owner
On our Google Business Profile, Semih Yıldız reports having engine and gearbox tuning installed on his G22 and being happy with the experience.
Vehicle: BMW G22. Service: engine and gearbox tuning. Source: Google Business Profile review.
B48B16: Flash services by model
- BMW G20 320i — 3 Series Sedan
- BMW G30 520i — 5 Series Sedan
- BMW B48B16 — 1.6-litre engine family
Workshop, appointments and directions
- MOSTUNED Ataşehir — Address, opening hours, map and WhatsApp
MOSTUNED / ATAŞEHİR
Our Work
From the MOSTUNED workshop: engine tuning, gearbox tuning and coding projects.
G22 · Engine and gearbox
Unlock, 300 HP engine tuning, burble and Stage 2 TCU completed together on this G22.
Contact
Get in touch
WhatsApp: +90 547 470 40 40
Email: destek@mostuned.com
Instagram: @mostuned
Istanbul · Monday–Saturday 09:00–18:00 (TR time) · Remote service by appointment
Not sure?
Send your model, hardware and goal — we will pick the right package together. We do not sell what does not fit.