Cart 0

Chosen Vehicle:

No Chosen Vehicle

BMS G5 2STEP Relay for manual transmissions - N54 JB4 Upgrades

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


  • £54.25
    exc. VAT £45.21
  • 2

Compatibility Check - Enter the last 7 digits of your VIN. We will double check compatibility for you before dispatching!

In Stock


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.


Compatibility Check

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. 



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



BMS do not offer warranty on this item.


Manufactured by

Burger Motorsports / Burger Tuning (BMS)


Part Number



BMS BMW N54JB4 Upgrades G5 2STEP Relay for Manual Transmissions Install Guide - ML Performance UK

Next Day UK Delivery

Get FREE Guaranteed next day UK delivery for orders over £50 (exc. VAT) on all in stock items. Same day dispatch available if your order is placed before 11:00 GMT on all in stock items!

Worldwide Shipping

We ship worldwide via DHL International, simply enter your full address at checkout to see the shipping option(s) and quote(s). Same day dispatch available if your order is placed before 11:00 GMT on all in stock items!

Customer Reviews

5 Based on 2 Reviews
5 ★
4 ★
3 ★
2 ★
1 ★
Write a Review

Thank you for submitting a review!

Your input is very much appreciated. Share it with your friends so they can enjoy it too!

Rob C

N54 2 Step Relay

This Relay Is Great For Launch Control Best Used With Anti Lag Chip And Back End Flash On Jb4 Top Service From ML Performance


Very pleased!

Excellent product. Fantastic communication & very quick delivery. What more could I ask for? :relaxed:️A Very happy customer!