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BMW Z4 M40i
B58 3.0 Twin-Turbo Inline-6 — G29
The G29 Z4 M40i is one of the most exciting open-top sports cars BMW has ever made. Powered by the brilliant B58 engine, it already feels fast — but with a bespoke remap it becomes something truly special.
Tuning Packages
Stage 1
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)
Stage 2
460-470
BHP
700
NM Torque
- ✓ Upgraded intake & intercooler recommended
- ✓ Downpipe upgrade recommended
- ✓ Transmission tune included
- ✓ Before & after dyno testing
⏱ Turnaround: 2–4 days
Z4 M40i — The B58 Sports Car
The G29 Z4 M40i shares its B58 engine and platform with the Toyota GR Supra — both cars benefit identically from the same tuning approach. The Z4's rear-wheel drive layout and low weight make the power gains feel even more dramatic than in heavier BMW models.
- → Factory power: ~340BHP — Stage 1 takes it to 440-450BHP
- → RWD layout makes every BHP feel more exciting
- → Free adjustments on all tuning work
Book Your Z4 M40i In Now
Tell us about your Z4 and what you're looking to achieve.
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Select Your Service
What are you looking to have done on your BMW Z4 M40i (B58)?