X3 / X4 M40i
B58 3.0 Twin-Turbo Inline-6 — G01 / G02 / G45
The X3 M40i and X4 M40i are the performance SUV sweet spot — practical, fast, and powered by the exceptional B58 engine. With a bespoke remap, they become genuinely rapid machines that can embarrass much more expensive cars.
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
X3 M40i vs X4 M40i — Same Power, Different Shape
Both the G01 X3 M40i and G02 X4 M40i share the same B58 engine and drivetrain. The G45 M50 (2025+) continues the same platform with updated hardware. All variants respond identically to tuning — the choice between them is purely about body style preference.
- → Factory power: ~360BHP — Stage 1 takes it to 440-450BHP
- → xDrive AWD handles the extra torque with ease
- → Free adjustments on all tuning work
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