JB4 Plug-and-Play Tuning Box Piggyback ECU Performance Tuner for Toyota 4Runner 2.4L Turbo 2025-on
JB4 Plug-and-Play Tuning Box Piggyback ECU Performance Tuner for Toyota 4Runner 2.4L Turbo 2025-on
JB4 Plug-and-Play Tuning Box Piggyback ECU Performance Tuner for Toyota 4Runner 2.4L Turbo 2025-on
JB4 Plug-and-Play Tuning Box Piggyback ECU Performance Tuner for Toyota 4Runner 2.4L Turbo 2025-on
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JB4 Plug-and-Play Tuning Box Piggyback ECU Performance Tuner for Toyota 4Runner 2.4L Turbo 2025-on

£908.70
£908.70
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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.

Backordered. Estimated to ship mid March.

Unlock serious performance from your 2025+ Toyota 4Runner 2.4L Turbo with the JB4 plug-and-play tuning module. Supplied by Nforcd in the UK, this advanced piggyback ECU delivers up to 60 hp at the wheels on a completely stock vehicle on pump fuel, with potential for even greater gains when paired with bolt-on upgrades, higher octane or E85 blends. The latest JB4 hardware is simple to fit, packed with smart safety features and comes with the JB4PRO smartphone app included for effortless control.

  • Proven gains of up to 60 hp to the wheels on a stock 4Runner on pump fuel, around 75 hp at the crank
  • Quick plug-and-play installation and removal, not VIN locked and can be resold later
  • Preloaded JB4 maps with on-the-fly switching between stock and performance maps, including ethanol compatible options
  • JB4PRO app for iOS and Android included for wireless setup, live gauges, logging of up to 20 parameters and free firmware updates
  • Integrated data logging and fault code read and clear via CANbus OBDII for refined, factory-smooth drivability and added safety
  • Boost-by-gear in lower gears to help traction, works with all driving modes and normal driving economy remains unchanged

Vehicle fitment: 2025+ Toyota 4Runner 2.4L Turbo I4 models.

Fuel requirement: 91 octane or higher recommended for performance gains.

Designed and assembled in the USA with a 5-year warranty. Nforcd knows the JB4 well and it has been a popular upgrade with our customers seeking a fast, reversible performance increase without permanent ECU flashing.

Order today to secure your place in the queue. Prefer professional installation? Fitting is available at Nforcd in Warwickshire. Request a quote via Sales@nforcd.com.