Nforcd Software - 440i - Stage 1 420bhp, Stage 2 440bhp+, Stage 2+ 460bhp+

BMW 440i ECU Remap and Performance Software Upgrade

Transform your 440i with a bespoke engine software upgrade that unleashes real, usable power from the B58 3.0 turbo petrol. This is not a generic file. Every map is tailored to your car, delivering sharper throttle response, stronger mid‑range pull and repeatable results you can trust. We run this package ourselves and our customers love the drivability, the punch and the consistency.

Power Levels

• Level One: up to 420 bhp
• Level Two: 440 bhp plus
• Level Two Plus: 460 bhp plus

What you get

• Bespoke ECU mapping built from the ground up for your vehicle, not a one‑size‑fits‑all file
• Health checks and a baseline power run before any changes, so we tune a healthy car
• Direct‑mount dynamometer testing with before and after results for proven gains
• Optional features on request, including cold start delete, customisable overrun burbles, and GTS‑style start‑up sound
• Bench unlock service available where OBD flashing is not possible on later ECUs
• Safety‑first approach that prioritises reliability as well as performance

Why choose MJ Modifications

• Specialists in BMW B58 remapping and performance software in the UK
• In‑house dyno verification and data‑driven calibration for consistent results
• Friendly aftercare and ongoing support
• Proven on our own cars and backed by excellent customer feedback

Perfect for drivers searching for

BMW 440i remap, B58 tuning, ECU flash, engine remapping UK, performance software upgrade, dyno tuned map, custom ECU map, power and torque increase, BMW 4 Series 440i performance, Stage 1 remap, Stage 2 remap, Stage 2 Plus map, overrun burble settings, cold start delete, GTS start‑up, bench unlock service, Warwickshire tuning specialist.

Fitting and booking

Installation and dyno verification available at MJ Modifications in Warwickshire. For pricing, availability and to request a quote, email info@mjmodifications.co.uk.