Pay in 4 interest-free payments of $74.88 Learn more
Ships within 48 hours · Estimated delivery Aug 11 - Aug 16
Please have a professional shop assist with install
You can also define your own performance windows for measuring both trap speeds and/or elapsed times
VRSF Lifetime Warranty against defects and fitment
SUPPLIED WITH:
• Quick Plug & Play Installation
BMS F8X S55 JB4 Tuner Chassis_E39 Please have a professional shopGains 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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