Unlock serious performance from your 2025 onwards BMW M5 with the JB4 S68 tuner. Designed for the latest G90 and G99 M5 models, this plug and play tuning box delivers proven gains of 93 whp on pump fuel and up to 135 whp on higher octane or E85 blends. No ECU flash is required and it works with locked ECUs, making it a straightforward, fully reversible upgrade trusted by Nforcd and popular with our customers.
- Built for the 4.4 litre S68-powered BMW M5 G90 saloon and G99 Touring 2025+
- Typical gains: 93 whp on pump petrol, up to 135 whp on higher octane or E85 mixtures
- Preloaded S68-specific software with up to 8 selectable maps for different fuels and modification levels
- Ethanol compatible tuning maps, including E85 support
- Smartphone integration via the JB4 PRO Bluetooth app to change maps, log data and update firmware
- View and record up to 40 live engine parameters, plus read and delete fault codes
- Boost by gear control in 1st, 2nd and 3rd to help optimise traction and launches
- Advanced CANbus OBDII integration and electronic wastegate control for smooth, factory-like drivability
- Improves 0 to 60 mph and quarter mile potential while retaining factory safety systems
- Quick plug and play installation with no cutting or splicing, fully removable and not VIN locked
- Compatible with all driving modes, fuel economy unchanged during normal driving
- Minimum 91 octane fuel required for performance gains
- Supplied in a rugged billet aluminium enclosure
- Made in the USA with a 5 year warranty
If you want a feature-rich, reversible tuning solution for your G90 or G99 M5, the JB4 delivers outstanding flexibility and real-world performance without touching the factory ECU. Nforcd can supply and support your JB4 setup, and we also offer professional fitting at our Warwickshire facility. To arrange installation or request a quote, contact Sales@nforcd.com.