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 Upgrade Kit



Upgrades your current JB3 control box to the latest JB4 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.

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

A $20 core deposit will be added to each unit ordered, which is refundable by returning your old control box via USPS to the address on our contact page. Please include a copy of your checkout receipt or Paypal email address when returning your old box for the core charge refund.

N54 JB4 Upgrade kit with mail in harness modificaiton

Same as above only you mail in your JB3 control box and harness first, we perform the JB4 wiring changes detailed in the directions link above, and then mail back your modified harness with the new JB4 control box ready to reinstall. JB3 should be mailed to address under contact us via USPS. Please allow up to a week turn around time once the JB3 is received.

N55 Stage2 / JB4 BETA Upgrade Kit
(Limited Availability)



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. Fits LHD 135 and 335 only. There is no Stage2 upgrade avaialble currently for RHD, 535, X3, X5, or X6 models. 

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

A $20 core deposit will be added to each unit ordered, which is refundable by returning your old control box via USPS to the address on our contact page. Please include a copy of your checkout receipt or Paypal email address when returning your old box for the core charge refund.

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.