M340i / M440i
B58 3.0 Twin-Turbo Inline-6
The G20 M340i and G22 M440i are powered by BMW's exceptional B58 engine — one of the most tuneable platforms on the market. With bespoke remapping, these cars transform into genuinely rapid machines while remaining perfectly usable every day.
Tuning Packages
440-450
BHP
650-700
NM Torque
- ✓ Bespoke ECU remap
- ✓ Transmission tune available
- ✓ Before & after dyno testing
- ✓ No hardware modifications required
⏱ Turnaround: 4–6 hours (same day)
460-470
BHP
700
NM Torque
- ✓ Upgraded intake & intercooler recommended
- ✓ Downpipe upgrade recommended
- ✓ Transmission tune included
- ✓ Before & after dyno testing
⏱ Turnaround: 2–4 days
480-490
BHP
750
NM Torque
- ✓ Turbo upgrade required
- ✓ Full supporting mods package
- ✓ Bespoke calibration on dyno
- ✓ Transmission tune included
⏱ Turnaround: 3–5 days (parts dependent)
M340i vs M440i — Same Engine, Same Gains
Both the G20 M340i (saloon/touring) and G22 M440i (coupe/convertible) share the same B58 engine and respond identically to tuning. Whether you want a rapid daily saloon or a powerful grand tourer, the gains are the same across both platforms.
- → Factory power: ~374BHP — Stage 1 takes it to 440-450BHP
- → xDrive AWD system handles the extra torque with ease
- → Free adjustments on all tuning work
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