BMS USB Cable 

This proprietary USB cable connects the JB control box to your laptop for use with our new datalogging, tuning, and map loading software. Cable may be left in engine bay and routed in the window or door when needed for a simple install. Alternatively it may also be routed behind the ECU in to the glove box for a clean install and on the fly access. Please do not attempt to use a standard RS232/USB cable with the JB as it will not work and may damage the processor. All JB software is posted on n54tech.com.

N54 JB4 G5 Upgrade Kit



Upgrades your JB3 or JB4 G4 control box to the latest JB4 G5 processor. Featuring 5x the processing power, 2x the memory, more robust signal conditioning, and of course integrated CAN. The CAN module allows the JB4 to communicate with your vehicle like never before. New features are too numerous to fully list but include code reading/deleting, optional in dash boost, timing, air/fuel, shift light, and IAT gauges, autotuning, a buttery smooth new CAN based integrated boost control system, steering wheel controls, built in downpipe fix, hot/cold oil temperature protection, progressive methanol integration, water pump remapping, and much more to come with simple firmware updates.

New with the G5 board we've added an optional isolated boost control system, flat foot / no lift shifting for manual transmission cars, a 2STEP rev limiter, speed limit defeat built in, integrated crank position offset built in, and extra expansion input/output.

Click here for JB4 upgrade directions and the latest firmware/software.

JB3->JB4 power wire



This power wire is required if updating from a JB3 harness.

N54 JB4 Upgrade kit with mail in harness modification

For those updating from an older JB3 PNP system you'll need to move around wires in your harness. If you're uncomfortable doing that rewiring then select this option where you mail the harness in, we'll modify it for you, and ship it back along with your new control box. Please allow up to a week turn around time once the JB3 is received.

N55 Stage2 (JB4) Upgrade Kit



Upgrades your current Stage1 control box to the latest Stage2 JB4 processor. Featuring 5x the processing power, 2x the memory, more robust signal conditioning, and of course integrated CAN. The CAN module allows the Stage2 to communicate with your vehicle like never before. New features are too numerous to fully list but include code reading/deleting, optional in dash boost, timing, air/fuel, shift light, and IAT gauges, autotuning, a buttery smooth new CAN based integrated boost control system, steering wheel controls, built in downpipe fix, hot/cold oil temperature protection, progressive methanol integration, water pump remapping, and much more to come with simple firmware updates. Includes required wires that you must add to your Stage1 harness to allow Stage2 to work. Fully released for all 135 and 335 E90 models. For RHD vehicles (UK, AU, HK, SG, SA, etc) you will also need the right hand drive extension harness available on the N55 Stage2 order page. For F10 535 models not all features are available. There is no Stage2 upgrade currently for X3, X5, X6, or new F30 models.

Click here for Stage2 upgrade directions and the latest firmware/software.

3' Extension Cable



3' Universal black USB extension cable for those who find the tuning cable is too short to reach their laptop. Required if routing the tuning cable in the door or window.