Unlock real BMW N55 power with the BMS JB4 Tuning Box for Pneumatic Wastegate
The BMS JB4 for BMW N55 Pneumatic Wastegate engines is the ultimate plug and play tuning box upgrade for M135i and 335i owners who want safe, repeatable power gains and next-level drivability. Expect up to 60 hp to the wheels on a completely stock car and up to 100 hp to the wheels on a fully modified setup. This N55 piggyback ECU delivers sharper throttle response, harder midrange, and stronger top-end while retaining factory smoothness and safety systems.
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Why choose the BMS JB4 for N55 PWG
- Power gains: up to 60 whp on stock cars and up to 100 whp on fully modified cars
- True plug and play harness for quick DIY installation
- On-the-fly map switching from the driver’s seat
- Gear-dependent boost control for improved traction
- Ethanol and racing fuel support
- Built-in diagnostic code reading and clearing
- Free JB4 firmware updates
- Optional BMS Data Cable for laptop data logging and tuning
- Optional JB4 Bluetooth Connect Kit for phone app control
We use JB4 on our own cars and customer cars, and the feedback has been consistently excellent for reliability, performance, and value.
Wastegate fitment guide
This listing is for BMW N55 engines with a Pneumatic Wastegate (PWG). If your N55 has an Electronic Wastegate (EWG) from around July 2013 onwards, you will need the BMS N55 JB4 for Electronic Wastegate. If you are unsure which wastegate you have, contact us and we will be happy to help.
Identifying your wastegate type
What’s included
- F-Chassis N55 JB4 (PWG)
- OBDII cable
Compatibility
BMW 1 Series
- 2012 to July 2013 N55 BMW F20 F21 M135i
BMW 3 Series
- 2012 to July 2013 N55 BMW F30 F31 335i and 335ix
- 2012+ N55 BMW F30 ActiveHybrid 3
- 2013 to July 2013 N55 BMW F34 335i xDrive GT
Performance gains and dyno examples
Gains depend on hardware, fuel quality, and map selection. Typical results are up to 60 whp on a stock vehicle and up to 100 whp on a fully modified car. Dyno-proven performance with smooth delivery and OEM-like drivability.
F30 335i with BMS intake, exhaust
F32 435i with BMS intake, exhaust
F22 M235i with intake, exhaust
Installation and fitting
The JB4 PWG kit is designed for straightforward plug and play installation. No permanent modifications are required and the unit can be fully removed.
Prefer professional fitting. Nforcd offers installation in Warwickshire. Request a quote at Sales@nforcd.com.
Compatibility check
For peace of mind, we run a compatibility check before dispatch. Provide your UK registration or the last 7 of your VIN at checkout and we will confirm fitment for your BMW N55 PWG model.
Notes
- JB4_F30 shipments as of 11/15/2014 include the FlexFuel add-on connector.
- The EWG add-on connector remains optional and is used for higher power applications where direct EWG control is required.
- F10 models should verify sensor type before ordering. This does not apply to F30 models.
Part number
F-N55-F30-JB4-PW (Pneumatic Wastegate)
Manufacturer and warranty
Manufactured by: Burger Motorsports
Warranty: 5 Year BMS Repair Warranty
Optional JB4 software and videos
JB4 Optional Phone Software
Change maps on the fly
JB4 S55 CAN Flap Demo
JB4 Optional Startup Gauge Sweep
Why buy from Nforcd
UK stock, expert advice, compatibility checked, and proven results. Nforcd is your trusted British BMW performance specialist for BMS JB4 tuning boxes, N55 upgrades, and installation support.