Burger Motorsports JB4 Plug & Play Piggyback ECU Tuning Box for Toyota GR Yaris (2021+) & GR Corolla (2023+) 1.6 Turbo
Burger Motorsports JB4 Plug & Play Piggyback ECU Tuning Box for Toyota GR Yaris (2021+) & GR Corolla (2023+) 1.6 Turbo
Burger Motorsports JB4 Plug & Play Piggyback ECU Tuning Box for Toyota GR Yaris (2021+) & GR Corolla (2023+) 1.6 Turbo
Burger Motorsports JB4 Plug & Play Piggyback ECU Tuning Box for Toyota GR Yaris (2021+) & GR Corolla (2023+) 1.6 Turbo
Burger Motorsports JB4 Plug & Play Piggyback ECU Tuning Box for Toyota GR Yaris (2021+) & GR Corolla (2023+) 1.6 Turbo
  • Load image into Gallery viewer, Burger Motorsports JB4 Plug & Play Piggyback ECU Tuning Box for Toyota GR Yaris (2021+) & GR Corolla (2023+) 1.6 Turbo
  • Load image into Gallery viewer, Burger Motorsports JB4 Plug & Play Piggyback ECU Tuning Box for Toyota GR Yaris (2021+) & GR Corolla (2023+) 1.6 Turbo
  • Load image into Gallery viewer, Burger Motorsports JB4 Plug & Play Piggyback ECU Tuning Box for Toyota GR Yaris (2021+) & GR Corolla (2023+) 1.6 Turbo
  • Load image into Gallery viewer, Burger Motorsports JB4 Plug & Play Piggyback ECU Tuning Box for Toyota GR Yaris (2021+) & GR Corolla (2023+) 1.6 Turbo
  • Load image into Gallery viewer, Burger Motorsports JB4 Plug & Play Piggyback ECU Tuning Box for Toyota GR Yaris (2021+) & GR Corolla (2023+) 1.6 Turbo

Burger Motorsports JB4 Plug & Play Piggyback ECU Tuning Box for Toyota GR Yaris (2021+) & GR Corolla (2023+) 1.6 Turbo

£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 serious performance from your Toyota GR Yaris or GR Corolla with the JB4 plug and play tuner. Designed for the 1.6 turbo three-cylinder engines, this proven piggyback tuning box works seamlessly with the factory ECU to increase boost while optimising timing and fuelling. On a stock car you can see gains of up to 50 whp and 60 wtq at the wheels, with crisp throttle response and reduced turbo lag, all without flashing the ECU. Available in the UK from Nforcd.

  • True plug and play installation to two easily accessed engine bay sensors, and removable without a trace
  • Operates with factory ECU strategies to remap boost, timing and fuelling for smooth, reliable power
  • High-speed 64 MHz processor samples sensors up to 800 times per second using dedicated 10-bit converters for refined control
  • Full CANbus integration for advanced mapping, logging and diagnostics, including boost, timing, air/fuel, fuel trims, throttle and knock control
  • Preloaded JB4 software for Toyota GR platforms with up to 8 selectable maps to suit fuel quality and basic modifications
  • Ethanol compatible maps, including E85 where available
  • Read and clear fault codes directly through the JB4 system
  • Monitor and record up to 40 live gauges via the JB4 app
  • Boost by gear control in 1st, 2nd and 3rd via the optional JB4 PRO app to help perfect your launch
  • Optional JB4 PRO Bluetooth adapter connects to iOS and Android for wireless logging, map switching and free firmware updates
  • Runs with all driving modes and leaves fuel economy unchanged during normal driving
  • Requires 91 octane fuel or better for performance gains
  • Not VIN locked, so it can be removed and resold in future
  • Supplied in a rugged billet aluminium enclosure
  • Made in the USA with a 5-year warranty, with ongoing free updates from BMS

Vehicle fitment

  • 2021 onward Toyota GR Yaris 1.6 turbo 3-cylinder
  • 2023 onward Toyota GR Corolla 1.6 turbo 3-cylinder

If you want a fast, reversible upgrade that avoids an ECU remap, the JB4 is a top choice for GR Yaris and GR Corolla owners. Order yours from Nforcd today. Prefer professional installation? Nforcd offers fitting in Warwickshire. Request a quote at Sales@nforcd.com.