BMW 540i G30/G31 B58 Remap, ECU Flash & Chip Tuning UK - 5 Series 3.0 Turbo Tune - Stage 1 420bhp, Stage 2 440bhp+, Stage 2+ 460bhp+ - Custom Dyno-Tuned Map, OBD Flash/Bench Unlock, xDrive/Saloon/Touring - Dyno Proven Calibration, Tuning File

BMW 540i G30-G31 B58 Performance Calibration - Proven power gains with expert engine software

Unlock serious real-world pace from your BMW 5 Series 540i with our bespoke engine software upgrade. This premium calibration for the turbocharged B58 delivers crisp throttle response, stronger torque throughout the rev range and a smoother, faster drive. Ideal if you are searching for BMW 540i tuning UK, G30 540i performance upgrade, G31 540i Touring tune, B58 software, engine control unit flash, ECU programming, dyno tuned file, OBD flash or professional bench unlock.

Expected gains

• Stage 1 - up to 420 bhp
• Stage 2 - 440 bhp plus*
• Stage 2+ - 460 bhp plus*

*Higher stages may require suitable supporting hardware. Results vary with vehicle health, fuel quality and setup.

Why this BMW 540i software

• Tailored calibration - custom file built for your specific G30 or G31 540i, not a generic one-size-fits-all map.
• Dyno verified - before and after runs in our controlled dyno environment with data logging to confirm repeatable gains.
• Safety-led approach - pre-tune checks to ensure the B58 is in good mechanical condition prior to any flashing.
• Refined drivability - linear boost control, progressive pedal mapping and strong midrange punch for effortless overtakes.
• Access solutions - OBD port flashing where possible or professional ECU bench unlock for later locked units.
• Customer options - cold start delete, adjustable overrun burble, GTS-style start up sound and preference-based features on request.

What is included

• Comprehensive health check and baseline assessment
• Custom calibration for the BMW 540i B58 engine
• Rolling road verification with before and after graphs where applicable
• Feature configuration to suit your preferences
• Post-tune validation for consistent, reliable results

Compatibility

Suitable for BMW 540i G30 saloon and G31 Touring with the B58 turbo petrol engine, including rear-wheel drive and xDrive models. Popular search terms include BMW 540i map UK, B58 tune G30, BMW 5 Series 3.0 turbo remap, 540i power upgrade Midlands, BMW 540i Warwickshire tuning, ECU flash 540i, G30 540i dyno tune, Stage 1 540i, Stage 2 540i, Stage 2 plus 540i.

Fitting and booking

For the best results we recommend professional installation and live calibration at MJ Modifications in Warwickshire. Request a fitting quote or book your session by emailing info@mjmodifications.co.uk.

Trusted by enthusiasts

We run this calibration on our own cars and customer feedback has been consistently excellent for performance, smoothness and reliability. If you are comparing BMW 540i tuning options, this is a proven route to bigger bhp, improved torque and a sharper, more engaging drive.

Important notes

• Supporting hardware may be necessary for Stage 2 and Stage 2+ setups.
• Power figures are indicative and depend on vehicle condition, fuel and operating environment.

Ready to unleash your BMW 540i G30-G31 B58 with a proper software upgrade? Book with MJ Modifications today and experience a safe, custom and dyno-validated tune that transforms the way your 5 Series drives.