BMW X3 M40i and X4 M40i tuning

BMW X3 M40i and X4 M40i remapping in Bristol, Somerset and South Wales

The X3 M40i and X4 M40i are quick, practical SUVs with the B58 under the bonnet, and they respond to tuning just as well as the saloons. We come to you from our Weston-super-Mare base, across Bristol, Somerset, Gloucestershire, Wiltshire, South Wales and parts of Devon and Dorset.

BMW X3 M40i and X4 M40i generations we tune

Factory figures vary by market and year. We confirm your car's exact ECU and software before quoting.

G01 X3 M40i and G02 X4 M40i (2018 on)

B58 3.0 turbo straight-six, 360hp and 500Nm. Later cars may need an ECU unlock first.

Performance SUVs, sharpened

The extra torque from a remap makes the M40i feel lighter and more responsive, which is particularly noticeable when towing or overtaking with a full car.

We calibrate for repeatable performance on an all-wheel-drive car used every day, and keep the factory protections in place.

Gearbox tuning

The ZF 8-speed is tuned to match the engine for higher torque limits and quicker shifts.

Related BMW pages

Common questions

Is towing affected by a remap?

The extra low-down torque usually makes towing easier. We calibrate within sensible limits for the engine and gearbox.

Is the X3 M40i engine the same as the M340i?

Both use the B58 straight-six.

Recent BMW jobs

BMWs we have tuned, with their figures.

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Customer feedback

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