BMS BMW N54 JB4 G5 2STEP/No Lift Shifting Relay (135i & 335i)

BMS BMW N54 JB4 G5 2STEP/No Lift Shifting Relay (135i & 335i)

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This add on kit for BMW N54 engines allows your JB4 to "2step" the engine (cycle power to the coils) to build boost when not under load. Useful as both a noisemaker for both manual and automatic transmissions, and for launching with manuals transmissions. It also allows No Lift Shifting (NLS) for manual transmission cars.

The relay kit requires a JB4, back end flash map, and BMS DATA cable or JB4 Connect Kit (Rev.3). Note that we've modified the JB4 firmware recently so that the clutch wire is no longer required simplifying the installation. Update your JB4 firmware before or after installation to v32_15 for twin turbo or v13_7 for single turbo to enable.

Customisable adjustment rpm for engagement and most user set it to 4000rpm.


This is compatible with N54 JB4 with the G5 board, for vehicles with manual or Automatic transmissions.


To ensure the part(s) you have ordered fits your vehicle, we run a compatibility check prior to dispatch. We can do this either using your registration number(UK) or the last 7 digits of your VIN. Simply enter your car details prior to checkout. 



Manufactured by

Burger Motorsports / Burger Tuning (BMS)



BMS do not offer warranty on this item.