Pay in 4 interest-free payments of $74.88 Learn more
Ships within 48 hours · Estimated delivery Aug 11 - Aug 16
You can also define your own performance windows for measuring both trap speeds and/or elapsed times
Wirelessly connect the JB4 to your Bluetooth 4
Please have a professional shop assist with install
this system is truly a cut above the rest and is engineered to last
i8 I15 i8 Roadster (B38X)
BMS F8X S55 JB4 Tuner Chassis_E39 You can also define yourGains are up to 80whp 100tq on pump gas and up to 120whp 140wtq on higher octane or E85 mixtures without the risks of flashing! The ultimate tuner for your S55 powered vehicle, the JB4 allows you to go from factory stock to full race, and everywhere in between, with the push of a button on your steering wheel or phone. The JB4 installs and removes easily and includes many unique features not found in any other tune including user adjustable 1st and
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