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JB4 Tuner for Mazda 2.5L Turbo

Regular price: £687.70
Sale price: £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 Mazda 2.5L Turbo with the JB4 plug and play tuning box. This proven piggyback ECU works alongside the factory ECU to optimise boost, timing and fueling for stronger acceleration, reduced turbo lag and smooth, OEM-like drivability. Installation is discreet, fully reversible and compatible with all driving modes, making it a smart remap alternative that leaves no trace when removed.

Power gains of up to 40whp and 50wtq on a stock vehicle
Fast plug and play install to two engine bay sensors with OBDII CANbus integration
High-speed 64 MHz processor samples sensors up to 800 times per second for ultra-smooth power delivery
Preloaded with up to 8 selectable maps, including ethanol E85 compatible options
Boost by gear control for improved traction in 1st, 2nd and 3rd
Reads and clears fault codes, plus advanced engine safety features for overboost or lean conditions
Optional JB4 PRO Bluetooth adapter for wireless logging, map switching and free firmware updates via the JB4PRO app
Log and view up to 40 live engine parameters including throttle, timing, trims and knock
Fuel economy unchanged during normal driving
Not VIN locked, easily removed and resold later
Rugged billet aluminium enclosure, designed and assembled in the USA
Manufacturer 5 year warranty

Nforcd knows the JB4 well and it has been a consistently popular upgrade for owners seeking a noticeable performance boost without an ECU flash. Expect improved 0 to 60 mph and quarter mile times with the refinement you want for daily driving. For best results use 91 octane fuel or better.

Vehicle fitment

2021+ Mazda 3 SKYACTIV 2.5L Turbo
2017+ Mazda 6 SKYACTIV 2.5L Turbo
2017+ Mazda CX-5 SKYACTIV 2.5L Turbo
2016+ Mazda CX-9 SKYACTIV 2.5L Turbo
2021+ Mazda CX-30 SKYACTIV 2.5L Turbo
2023+ Mazda CX-50 SKYACTIV 2.5L Turbo

What is the JB4? It is an advanced piggyback tune for turbocharged engines that intercepts specific sensor and CANbus data, then adjusts boost, ignition and fueling in real time. You get significant, safe power gains while retaining factory safeguards and without unlocking or flagging the ECU. Free firmware updates add new maps and features as development continues.

Order today from Nforcd for fast UK delivery. Professional fitting is available at Nforcd in Warwickshire. Request a fitting quote via Sales@nforcd.com.