JB4 Plug & Play Tuning Box Piggyback for
JB4 Plug & Play Tuning Box Piggyback for
JB4 Plug & Play Tuning Box Piggyback for
JB4 Plug & Play Tuning Box Piggyback for
JB4 Plug & Play Tuning Box Piggyback for
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JB4 Plug & Play Tuning Box Piggyback for

£778.70
£778.70
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Tax included. Shipping calculated at checkout.

Heads-up on cancellations & returns: if you cancel an order or return an item, you won't get back 100% of what you paid. We apply a 10% restocking fee, the outbound shipping is non-refundable, and we have to pass on Shopify / PayPal payment processing fees; these aren't returned to us when we refund you. International orders also lose on exchange-rate spread in both directions. If the original packaging is damaged or missing, a reboxing charge applies. For international orders specifically, if you refuse to pay our shipping invoice or supply a prepaid label after placing the order, the same deductions apply. We're upfront about this — please be sure of your purchase before ordering.

Unlock responsive, reliable power from your 2.0 litre turbo Range Rover with the JB4 plug and play tuning module. Designed for 2021+ Velar, Evoque, Discovery and Defender models with P250 and P300 engines, the JB4 adds serious performance while maintaining factory refinement. Expect gains of up to 30hp and 50lb ft at the wheels on a stock vehicle, improved throttle response and quicker acceleration, all without an ECU flash. Supplied by Nforcd for fast UK delivery and expert support.

  • Power gains of up to 30hp and 50lb ft at the wheels on a stock car
  • No ECU remap required and works with locked ECUs
  • True plug and play harness for quick, reversible installation
  • Preloaded JB4 software with up to 8 maps for different fuels and setups
  • Ethanol E85 compatible mapping available
  • Gear based boost control to aid traction and launches
  • Integrated CANbus OBDII for advanced control, safety and smooth OEM like drivability
  • Read and clear fault codes from the unit
  • Optional Bluetooth connectivity via JB4 mobile app for map changes, data logging and free firmware updates
  • Fuel economy unchanged during normal driving
  • Not VIN locked, removable without a trace and transferable to another vehicle
  • Rugged billet aluminium enclosure, designed and assembled in the USA
  • Backed by a 5 year warranty

Vehicle fitment

  • 2021+ Range Rover Velar 2.0L 4 cylinder turbo P250 and P300
  • 2021+ Range Rover Evoque 2.0L 4 cylinder turbo P250 and P300
  • 2023+ Land Rover Discovery 2.0L 4 cylinder turbo
  • 2021+ Land Rover Defender 2.0L 4 cylinder turbo

What is the JB4?
The JB4 is a sophisticated piggyback tuning system that sits between your engine sensors and ECU to optimise boost and related parameters using live CANbus data. It delivers smooth, safe power gains while retaining factory safety systems. Free firmware updates add features and maps over time, and the optional Bluetooth app enables deep data logging and easy map selection from your phone.

Choose Nforcd for trusted advice and quick dispatch in the UK. Professional installation is available at Nforcd in Warwickshire. To request a fitting quote, email Sales@nforcd.com.