M340i / M440i
G20 / G22 · 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
Femto ECU unlock included · Figures on 99 Esso
450–460
BHP
700–750
NM Torque
- ✓ Bespoke ECU remap
- ✓ Transmission tune available
- ✓ Before & after dyno testing
- ✓ No hardware modifications required
Pre-June 2020 models deduct £650 (no Femto needed)
Figures on 99 Esso
500–510
BHP
750–800
NM Torque
- ✓ Upgraded intake & intercooler recommended
- ✓ Downpipe upgrade recommended
- ✓ Transmission tune included
- ✓ Before & after dyno testing
480–490
BHP
750+
NM Torque
- ✓ Turbo upgrade required
- ✓ Full supporting mods package
- ✓ Bespoke calibration on dyno
- ✓ Transmission tune included
Add-ons
- → MHD Super Licence (optional) £450
- → OPF gut alternative (Stage 2) −£250
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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