I'm currently running MHD and I want to upgrade to a 3.5 bar. I went on BMS and they sell an adapter but I don't understand, it says n54 and also JB4 (
http://www.burgertuning.com/N54_JB4_upgrades.html ) . Do I need JB4 to use this adapter? Also, I saw the sensor on ECStunning website but I can't seem to find one compatible with 335 N55 motor. If anyone could point me in the right direction I would appreciate it. Thank you