BMW X4 remap

The X4 M40i shares its B58 3.0-litre turbocharged straight-six and xDrive drivetrain with the BMW X3. The two are effectively the same platform under different bodywork, and both get exactly the same calibration approach here. Factory output on the B58 in this application is 355 bhp on the pre-facelift car (2018 to 2021), rising to 382 bhp on the facelifted, mild-hybrid-assisted version from 2022 onward, and xDrive is standard across the range.

. As with the X3, the B58's factory calibration is set conservatively to cover a wide range of markets and fuel qualities, and there is real headroom above it once the boost and fuelling are mapped properly rather than pushed harder without regard for how xDrive is actually distributing torque.

Owners sometimes assume the X4's coupe-like roofline changes how the car should be calibrated compared with the X3. It does not. The powertrain and drivetrain are shared in full, and the only difference that matters here is badge and bodywork, not anything under the skin that a remap needs to account for.

Stage 1 is available on the X4 remotely via Bootmod3 or MHD, or in person at Eccles if preferred. Stage 2 is available where supporting hardware is fitted, and we will advise honestly on suitability rather than push it by default. An economy remap suits owners covering higher motorway mileage. We remap the automatic gearbox alongside the engine, and a standalone rolling road session is available without a full remap. As with the X3, launch control is codeable and adjustable where the car is specified with it from the factory.