BMW Tuning,
All Day, Every Day

A custom Stage 1 dyno tune is £449 including VAT for most BMWs. B58 and M models are priced higher because the software and the work cost more. xHP gearbox software starts at £325, and booking the engine map and gearbox together saves £125.

Yes. BMWs built after June 2020 have encrypted MG1 and MD1 ECUs. We bench-unlock them in-house during the same appointment rather than posting your ECU away, and the job is booked as a 4 hour slot. The unlock is one-off — later maps do not need repeating.

Around 385 to 390 bhp on a custom dyno-written Stage 1. The N57 is our speciality engine and that figure is measured on our own 4WD rolling road, not estimated.

Up to 420 bhp on Stage 1 depending on the exact car and its state of tune. The B58 sits in the M140i, M240i, 340i, 440i and 540i among others — our B58 page lists the whole line-up with figures.

Not strictly, but on a ZF8 automatic it is the difference between the gearbox allowing the new torque figure and quietly limiting it. xHP lifts the torque limiters and sharpens the shifts. Booked with an engine map the pair is £125 cheaper.

Yes, and properly. Our dyno is 4WD-linked with mechanical axle synchronisation, which is what an xDrive car needs to be loaded safely and measured accurately. A single-roller rig cannot do it.

Yes. We keep your original file so the car can be returned to standard at any point. You do need to declare the remap to your insurer.

Around 3 to 4 hours for a standard Stage 1, or a 4 hour slot if the ECU needs unlocking first. It is a same-day job and you are welcome to wait.