JB4 Plug and Play Piggyback ECU Tuning Box for Lexus NX350 / RX350 / TX350 2.4L 4-Cyl Turbo 2022+
JB4 Plug and Play Piggyback ECU Tuning Box for Lexus NX350 / RX350 / TX350 2.4L 4-Cyl Turbo 2022+
JB4 Plug and Play Piggyback ECU Tuning Box for Lexus NX350 / RX350 / TX350 2.4L 4-Cyl Turbo 2022+
JB4 Plug and Play Piggyback ECU Tuning Box for Lexus NX350 / RX350 / TX350 2.4L 4-Cyl Turbo 2022+
JB4 Plug and Play Piggyback ECU Tuning Box for Lexus NX350 / RX350 / TX350 2.4L 4-Cyl Turbo 2022+
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  • Load image into Gallery viewer, JB4 Plug and Play Piggyback ECU Tuning Box for Lexus NX350 / RX350 / TX350 2.4L 4-Cyl Turbo 2022+
  • Load image into Gallery viewer, JB4 Plug and Play Piggyback ECU Tuning Box for Lexus NX350 / RX350 / TX350 2.4L 4-Cyl Turbo 2022+
  • Load image into Gallery viewer, JB4 Plug and Play Piggyback ECU Tuning Box for Lexus NX350 / RX350 / TX350 2.4L 4-Cyl Turbo 2022+

JB4 Plug and Play Piggyback ECU Tuning Box for Lexus NX350 / RX350 / TX350 2.4L 4-Cyl Turbo 2022+

£687.70
£687.70
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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 effortless power on your Lexus 2.4 turbo with the JB4 plug and play tuning module. Designed for 2022+ Lexus NX 350, 2023+ RX 350 and 2024+ TX 350 2.4L 4-cylinder turbo models, the JB4 delivers proven gains of up to 40 hp at the wheels, around 55 hp at the crank on a completely stock car when using premium fuel. No ECU flashing, no permanent changes, just a refined, responsive upgrade that feels factory-smooth. Available now from Nforcd in the UK.

  • Plug and play power module for Lexus NX 350, RX 350 and TX 350 2.4 turbo
  • Power gains of up to 40 whp on a stock vehicle on premium pump fuel
  • Preloaded Lexus-specific JB4 software with up to 8 selectable maps
  • On-the-fly map switching, including factory map, for ultimate flexibility
  • CANbus OBDII integration for advanced control and safety
  • Boost by gear for improved traction in lower gears
  • Ethanol compatible tuning maps, including E85 where available
  • Built-in data logging and fault code read and delete
  • Optional Bluetooth smartphone connectivity via the JB4 app for live gauges, logging and map changes
  • Supports progressive water-methanol setups
  • Runs smoothly like stock and works with all driving modes
  • Fuel economy unchanged during normal driving
  • Not VIN locked, easily removed without a trace and can be resold
  • Rugged billet aluminium enclosure
  • Made in the USA with a 5 year warranty

The JB4 is a sophisticated piggyback tune that interfaces with key engine sensors and CANbus to optimise boost, timing, AFR and fuel trims while retaining factory safety systems. It is an ideal remap alternative for those who want reliable performance and flexible tuning without unlocking the ECU. No additional modifications are required to enjoy the core benefits, and firmware updates and new maps are supported as development continues.

Vehicle fitment

  • 2022+ Lexus NX 350 2.4L 4-cylinder turbo
  • 2023+ Lexus RX 350 2.4L 4-cylinder turbo
  • 2024+ Lexus TX 350 2.4L 4-cylinder turbo

Premium unleaded is required for performance gains. For even greater control, add the optional JB4 Bluetooth adapter and use the free JB4 app to view up to 40 live parameters, switch maps and update firmware.

Nforcd knows this product well and it has been a popular upgrade with our customers seeking a safe, reversible performance boost. Order your JB4 today for fast UK delivery. Prefer professional installation. Fitting is available at Nforcd in Warwickshire. Request a quote via Sales@nforcd.com.