BMW Performance Chips & Software

Performance tuning for your BMW gives it more efficient and effective ECU mapping which favor power delivery over comfort. BMW tuning legend Jim Conforti produces incredible software tunes for nearly every model to give drivers a noticeable upgrade in their car's capabilities. The Turner Chips, Shark Injectors, Sprint Boosters, and Burger Motorsports tuning software and handheld devices are all right here for you to give your BMW the engine management change it deserves.

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S58 JB4Pro Performance Tuner - BMW G8X M2 M3 M4

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

T#:49543767

Part#: S58JB4PRO

Ships on Jul 28, 2026

$ 899.00 USD

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$ 899.00 USD

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The ultimate tune for your S58-powered G87 M2, G80 M3, or G82 M4, the JB4 allows you to go from factory stock to full race and everywhere in between. The JB4 installs and removes easily and includes many unique features not found in any other tune, including user-adjustable 1st and 2nd gear boost limiting, smartphone integration, electronic wastegate control, ethanol fuel support, and built-in advanced CANbus-based diagnostic tools. Installation is easy and completely removable with no splicing or cutting of factory wires making the JB4 an excellent choice for your S58 engine. This new JB4PRO board includes built-in Bluetooth, fuel pressure control for more advanced tuning with ethanol mixtures, built-in flex fuel/port injection/WMI control using our PNP add-on harness, includes onboard data-logging memory, and includes many additional features to be unlocked in the future via free firmware updates!

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