JB4 Tuner S58 2021+ BMW G80 M3, G82 M4, 2023+ G87 M2

OVERVIEW

The JB4 for the S58-powered G87 M2, G80 M3, and G82/G83 M4 delivers 80whp/100wtq on pump gas and up to 150whp/175wtq on higher octane or E85 mixtures. Both versions now include the free JB4PRO app.

SPECS

• Up to 150whp/175wtq gains depending on fuel
• User-adjustable 1st and 2nd gear boost limiting, electronic wastegate control, ethanol fuel support, and built-in advanced CANbus-based diagnostics
• JB4PRO board: built-in Bluetooth, fuel pressure control for ethanol tuning, flex fuel/port injection/WMI control via optional PNP add-on harness, onboard data-logging memory
• Optional Flex Fuel & Port Injection add-on harness for direct ethanol sensor reading and multi-stage batch fire injector control
• Optional MAP sensor bypass extension harness to simplify install/removal by bypassing the hard-to-reach lower MAP sensor
• Displays and logs up to 40 engine parameters; reads/deletes fault codes; full CANbus integration
• Not VIN-locked and fully removable; includes billet aluminum enclosure
• Designed and assembled in the USA; 5-year warranty
• 91 octane or better required for performance gains

PARTS INCLUDED

• 1x JB4 (or JB4 Pro) tuner unit in billet aluminum enclosure
• Plug-and-play installation harness

TECH RESOURCES

• Easy, fully removable installation with no splicing or cutting of factory wires
• See the install guide for step-by-step instructions

PART NUMBER

• BMS-JB4-BMW-G8X

VEHICLE APPLICATIONS