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N54 JB4 BMW Performance Tuner ML Performance

BMS BMW N54 JB4 Tuning Box (1M, 135i, 335i & Z4)


  • £479.00
    exc. VAT £399.17
  • 9 reviews

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

ADD 100 Horsepower to your Twin Turbo BMW Instantly!

2007-2010 BMW 135 335 535 Z4 X6 and 2011-2013 335is 1M and Z4 N54 Twin Turbo 


You may also wish to add the Data Cable or the Bluetooth Connect Kit for additional features.


Ready to take your twin turbo BMW to the next level?

How about up to 80hp to the wheels (100hp crank) on a completely stock car, up to 160hp to the wheels on factory turbos, or up to 350hp to the wheels on a fully modified car with larger turbo(s)? The JB4 includes a simple plug and play installation harness and is compatible with all ECU versions and transmission types. It's everything you need to take your N54 powered vehicle from mild to wild!

In addition to several performance maps which can be selected "on the fly" right from the drivers seat the JB4 includes a 100% stock bypass map, a valet mode, ethanol fuel (E85) support, progressive water/methanol injection support, racing fuel map, an auto tuning map that adjusts the JB4 mapping to your current climate, octane, vehicle condition, and modifications continuously, and for those interested an rpm by rpm user adjustable map. Other features include optional in dash gauges for boost and other engine parameters, a programmable shift light, on the fly adjustable torque limiting to aid with launches at the track, an optional 2STEP rev limiter & no lift shifting for manual transmission cars, an optional speed delimiter, and much more.

Remember the JB4 does not require any additional modifications or previous stages. Simply install the JB4 as your first and only modification and enjoy an entirely new fast and smooth racing experience. As you decide to modify your car further the JB4 is setup to grow with your vehicle. Whether you're racing a 100% OEM car on pump gas or a 700whp single turbo drag queen, the JB4 has the perfect mix of performance, features, flexibility, and support to ensure your car performs to the best of its potential!


Features and Benefits 

  • Power gains of up to 100hp and 100tq to the wheels on a stock vehicle
  • Quick Plug & Play Installation
  • CANbus integration offering unrivaled tuning features and performance
  • Runs as smoothly as stock, this is how your N54 should have come from the factory
  • Compatible with all driving modes
  • Fuel economy unchanged during normal driving
  • Compatible with JB4 Mobile for smartphone logging, tuning changes, and adjustment
  • Ethanol (E85) compatible tuning maps
  • Able to read/delete fault codes
  • Not VIN locked, can be removed without a trace and resold down the road


Maps as of v32_12+ firmware  (Last updated on 06.03.2020)

Map 0: Stock bypass.
Map 1: 13psi. Suggested for most racing applications.
Map 2: 14.5psi. Suggested for those with intake and other bolt on modifications with 93 RM2 or higher octane.
Map 3: Progressive WMI water injection mapping with failsafe.
Map 4: Stock map w/ CAN active. Allows full logging and in dash gauges on the stock mapping.
Map 5: Autotuning map. Boost ranges between 12-17psi based on your cars octane, conditions, and modifications. E85 compatible. If using E85 we suggest around 30% to start. Refer to the E85 FAQ for addl info. Resets to 93 octane level adaptions when selected and adjusts itself up or down from there.
Map 6: User defined map generally only used for diagnostics or troubleshooting.
Map 7: Race gas map. 18.5psi peak boost on the G5 ISO. Requires straight 100-104+ RM2 octane unleaded racing fuel. Never run leaded fuel. To use this map with E85 requires the E85 back end flash, inline booster fuel pump, and a 40%+ E85 mix, per E85 FAQ.
Map8: Valet low boost map. May trigger 30FF under boost code in cars not also equipped with the back end flash map.

1) Steering wheel controls menu and video is in the 3rd post down.
2) JB4 has cold/hot oil protection built in. So expect stock like boost until oil temps are > 160 degrees. Same goes for oil temps > 280 degrees.

3) The JB4 has several safety systems built in that will force a switch to map 4 (low boost) if the JB4 notices various conditions. Including boost over target, fuel pressure below target, and air/fuel ratio running lean. If you ever encounter an automatic switch to map 4 review the FAQ below for addl information.


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. 



BMW 1 Series

  • 2008-2010 E82 Coupe 135i
  • 2008-2010 E88 Convertible 135i
  • 2011 E82 1M

BMW 3 Series

  • 2006-2010 E90 Sedan 335i/335ix
  • 2006-2010 E91 Touring 335i/335ix
  • 2006-2010 E92 Coupe 335i/335ix
  • 2007-2010 E93 Convertible 335i/335ix
  • 2011-2013 E92 335is

BMW 5 Series

  • 2008-2010 E60 Sedan 535i/535ix
  • 2008-2010 E61 Touring 535i/535ix

BMW X Series

  • 2009-2010 BMW E71 X6 xDrive35i

BMW Z Series

  • 2009-2016 BMW Z4 sDrive35i/is

Fully compatible with DCT transmissions. 


Free Next Day Delivery

FREE UK next day delivery if ordered before 11am on all in stock items. We can also ship worldwide, simply enter your full address during checkout for a shipping quote.



5 Year BMS Repair Warranty


Manufactured by

Burger Motorsports


Part Number



BMS BMW E Chassis N54 JB4 (1M, 135i, 335i, 535i, X6 & Z4) Installation Guide - ML Performance

JB4 Dyno results

Stock, JB4 on a completely stock automatic 135i, on 91 octane
Stock, JB4 on a completely stock automatic 135i, on 91 octane


JB4 on an automatic 335i with Exhaust and BMS intake, on 93 octane
JB4 on an automatic 335i with Exhaust and BMS intake, on 93 octane


JB4 Dyno Result JB4, Exhaust, BMS intake, BMS Flash, on 50% E85 fuel ML Performance

JB4, Exhaust, BMS intake, BMS Flash, on 50% E85 fuel


JB4, RB Hybrid Turbo Upgrade, Exhaust, BMS intake, BMS Flash, BMS Methanol Injection, Larger Intercooler, on 50% E85 fuel

JB4, RB Hybrid Turbo Upgrade, Exhaust, BMS intake, BMS Flash, BMS Methanol Injection, Larger Intercooler, on 50% E85 fuel


JB4 Optional Phone Software


JB4 Plug and Play Video Install Guide


JB4 135i 335i Steering Wheel Controls Demo Video


JB4 Optional In Dash Boost Gauge / Shift Light Demo


JB4 Optional Startup Gauge Sweep



24.5cm x 16cm x 6cm




Customer Reviews
5 Based on 9 Reviews
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Filter Reviews:
Ricardo B.
United Kingdom United Kingdom
N54 jb4 + Bluetooth device + ngk colder spark plugs

In regards to the above items purchased, all very good and received on time, overall very happy with service items are great quality items,pacaged very well, very happy costumer, best tuner shop in uk in how they can source otherwise difficult items even at a time of viral crosses like during corona pandemic, very helpful online always ready to help and on point. Will be back again and again as why waste time elsewere when all you need for your mean machine is here. Ricardo.

ML Performance BMS BMW N54 JB4 Tuning Box (1M, 135i, 335i & Z4) ReviewML Performance BMS BMW N54 JB4 Tuning Box (1M, 135i, 335i & Z4) ReviewML Performance BMS BMW N54 JB4 Tuning Box (1M, 135i, 335i & Z4) Review
Lambros C.
Finland Finland
Happy with the purchase

Good overall product. Great customer service and I would recommend it to anyone going for some extra power on their N54. Also ML Performance has great pricing compared to other EU competitors. Highly recommended!

Dom S.

Delivered next day, with a personal note (it's always a good touch when the service is personal). Install was quite easy and straight forward, and once you put it in to map 5 and go for a few 3rd gear pulls, it drives likes an animal... 510BHP and counting.

Steven R.
United Kingdom
JB4 purchase.

Third time buying from ML performance. Again dispatched promptly and with good communication also the note is a nice touch. Will be using again soon.

robert v.
United Kingdom
Bmw n54 jb4 purchase

I bought the jb4 race chip for my bmw from ML performance and I found them to be very professional and very competitive in there price and after service, really happy with the product and performance that it gives. 5Stars"