OVERVIEW

Around 80 wheel horsepower and 100 lb-ft on pump gas, and up to 150whp and 175wtq on higher octane or E85 — with the factory ECU completely untouched. The JB4 talks to the S58 through its sensor network and CANbus, which is why it works on locked DMEs and does not break when BMW pushes an over-the-air update. Installation is plug-and-play, no wire splicing, and fully reversible.

Both the standard JB4 and the JB4PRO include the JB4PRO Bluetooth adapter and the free app, so wireless map switching, live gauges, datalogging and firmware updates from your phone are standard either way. The JB4PRO is a different board built for heavily modified cars. Stock or bolt-ons, the standard JB4 is the right call; building toward E85, port injection or methanol, go PRO.

SPECS

Gains of around 80whp and 100wtq on pump gas, and up to 150whp/175wtq on higher octane or E85 mixtures
Piggyback tuner — works through the S58 sensor network and CANbus, with no ECU flash
Runs on locked DMEs and survives BMW over-the-air software updates
Multiple switchable maps, including E85 ethanol blends
Boost-by-gear limiting for traction in the low gears
Live gauges, datalogging, and fault code reading and clearing over CANbus
Plug-and-play install with no wire splicing, fully reversible
Not VIN-locked — transfers between cars
JB4PRO board adds direct ethanol sensor control
JB4PRO board adds port injection / CPI / WMI control via the PnP add-on harness
JB4PRO board adds built-in fuel pressure control for advanced tuning on ethanol mixtures
JB4PRO board adds onboard datalogging memory
JB4PRO board adds additional high-current outputs for extra pumps, relays and solenoids
JB4PRO board adds additional inputs for monitoring external sensors
JB4PRO board carries Bluetooth and memory on the board itself rather than via the adapter
JB4PRO board adds CANbus integration with flash tuning
Free firmware updates
5-year warranty
Designed and assembled in the USA

PARTS INCLUDED

JB4 tuner in a billet aluminum enclosure
Plug-and-play installation harness (no wire splicing)
JB4PRO Bluetooth adapter
Free JB4PRO smartphone app (iOS and Android)

TECH RESOURCES

Additional Parts Required

91 octane minimum for the pump gas maps; higher octane or an E85 blend to reach the quoted 150whp/175wtq figures.
A compatible smartphone running the free JB4PRO app for map switching, live gauges, datalogging and firmware updates. The Bluetooth adapter is included with both the JB4 and the JB4PRO.
On a standard JB4 running ethanol, add the JB4 Fuel Pressure Upgrade Kit for direct fuel pressure and fuel trim control. Skip it if you are buying the JB4PRO — that is already built in.
Port injection, CPI or WMI control on the JB4PRO requires the PnP add-on harness, sold separately.

Installation

Burger Motorsports 2021+ G80 M3 / G82 G83 M4 / G87 M2 S58 JB4 Install Guide (PDF)

Notes

Burger Motorsports does not publish an official part number for this tuner, so no part number is listed. Driving an X3M or X4M? Use the S58 JB4 for the F97/F98 chassis instead. If you would rather flash the ECU, we also carry the MHD Super License and the bootmod3 tune for the S58.

VEHICLE APPLICATIONS

Make / Model	Chassis	Engine	Years
BMW M3, M3 Competition (incl. xDrive)	G80	S58 3.0L Twin-Turbo I6	2021+
BMW M4, M4 Competition (incl. xDrive)	G82	S58 3.0L Twin-Turbo I6	2021+
BMW M4 Convertible	G83	S58 3.0L Twin-Turbo I6	2021+
BMW M2	G87	S58 3.0L Twin-Turbo I6	2023+