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BMS BMW N55 JB4 Tuning Box for Electronic Wastegate (M135i, M235i, M2, 335i & 435i)

4 reviews
Regular price £502.55 GBP
Regular price £529.00 GBP Sale price £502.55 GBP
Jubilee Sale Sold out
exc. VAT £418.79 GBP
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Ready to take your twin turbo BMW to the next level?

How about up to 60hp to the wheels (80hp crank) on a completely stock car or up to 100hp to the wheels (120hp crank) on a fully modified car? The JB4 features a simple plug and play installation harness for easy installation and includes many features not found on any other tune. Including the ability to enable/disable the tuning from the drivers seat, gear dependent boost control to help with traction, ethanol and racing fuel support, built in diagnostic code reading/deleting, free firmware updates, 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. The JB4 also does not require any user setup or customization but for more advanced enthusiasts the BMS DATA cable allows you to connect via a laptop for data logging and free software updates.

Note JB4_F30 shipments as of 11/15/2014 include the FlexFuel add on connector. This no longer needs to be purchased separately for these models. Also note the EWG add on connector remains optional and can be purchased separately for higher HP applications where direct EWG control is required.


Map Info (Updated on 17.07.2018)

(selected via menu 0 in dash or using JB4 Mobile/laptop interface. Map1 is the default map)

Map 0: JB4 disabled 
Map 1: Additive target, around 4psi over stock.
Map 2: Additive target, around 6psi over stock. Suggested for those with 93 octane and bolt on modifications. Also good for small E85 mixtures. 
Map 3: Progressive WMI mapping.
Map 4: Stock performance with JB4 active for logging only.
Map 5: Autotuning map, absolute target of 11-17psi based on octane and conditions. 
Map 6: User definable absolute target map. Suggested for troubleshooting by professionals only. 
Map 7: Race gas map. Absolute target of 18.5psi. Requires straight unleaded race gas.


F Chassis N55 JB4 (EWG)

OBDII cable


BMW 1 Series
 July 2013+ N55 BMW F20 F21 M135i

BMW 2 Series
 2014+ N55 BMW F22 F23 M235i
• 2016+ N55 BMW F87 M2

BMW 3 Series
• July 2013+ N55 BMW F30 F31 335i/ix
• July 2013+ N55 BMW F34 335i xDrive GT

BMW 4 Series
• 2014+ N55 BMW F32 F33 F36 435i / 435ix

For E Chassis N54 JB4 Click Here


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.


F Series N55 JB4 Dyno results

BMW F Series N55 JB4 (M135, M235i, M2, 335i & 435i) Dyno - F30 335i with BMS intake, exhaust ML Performance UK
F30 335i with BMS intake, exhaust


BMW F Series N55 JB4 (M135, M235i, M2, 335i & 435i) Dyno - F32 435i with BMS intake, exhaust ML Performance UK
F32 435i with BMS intake, exhaust


BMW F Series N55 JB4 (M135, M235i, M2, 335i & 435i) Dyno - F22 M235i with intake, exhaust ML Performance UK

F22 M235i with intake, exhaust


Identifying Wastegate Type


BMS BMW F SERIES N55 JB4 (M135 M235I M2 335I 435I) | NEXT DAY DELIVERY ML Performance UK


F-N55-F30-JB4-EW (Electronic Wastegate)


Manufactured by

Burger Motorsports


5 Year BMS Repair Warranty

JB4 Optional Phone Software


Change maps on the fly:


JB4 S55 CAN Flap DEMO:


JB4 Optional Startup Gauge Sweep

F10 models will need to check their sensor type before ordering.
This does not apply to F30 models.

Click here for the latest JB4 firmware, map guide, and details.

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JB4 M135i

Quick delivery, great service. Very happy with the product and would definitely use ML performance again for any future products I’d be looking to purchase.


Superb company. Highly recommended !

Have ordered numerous products from MLP now and can gladly comment on how brilliant they are to deal with Quick and knowledgeable responses to any queries I’ve had about their products. Keep so much in stock to save you time and hassle importing from US suppliers - whilst importantly remaining competitively priced. Finally, their shipping is fast - something all petrol heads want when ordering parts. The JB4 is superb, highly recommend it for any BMW owner - transforms the car. Get one, you won’t be disappointed.


Excellent service, couldn't have been better

Ordered my jb4 at about lunch time and it arrived the next day. Great guys to deal with and will always try and help you out. Used several time since for other parts


Great service ! Great product !

I only ordered the item on the Thursday but was in a rush to fit it on the weekend. Pretty much straight away I was contacted to say the item had been packaged up and ready to be sent out and sure enough the parcel was with me early the next day, fantastic ! Very polite contact all the way throughout, seems to me like a very well set up business. Would order again from here without any shadow of a doubt. Thank you !