BMS BMW N55 JB4 (135i, 335i and X1)
Finally a JB4 for your N55 "Twin Power" BMW!
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 on the fly in dash map switching between factory and various performance maps, optional in dash gauge displays for boost and other critical engine parameters, progressive water/methanol support, ethanol fuels support, built in code reading, 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 customisation but for more advanced enthusiasts the BMS DATA cable allows you to connect via a laptop for data logging and free software updates.
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.
In the box:
E Seires N55 JB4
RHD Extension Harness Upgrade
BMS Data Cable (Optional)
BMW 1 Series
• 2011-2013 N55 BMW E82 E88 135i LHD
BMW 3 Series
• 2011+ N55 BMW E90 E91 E92 E93 335i/ix
BMW X Series
• 2011+ N55 BMW X1
Next Day Delivery
FREE UK next day delivery if ordered before 11am if in stock! We can also ship worldwide, simply contact us for a quote.
5 Year BMS Repair Warranty
E-N55-JB4-A (Harness A)
E-N55-JB4-B (Harness B)
JB4 Dyno results
JB4, Exhaust, E85 Fuel Dyno
JB4, Exhaust, Hybrid Turbo, E85 Fuel Dyno
JB4 Optional Phone Software
JB4 135i 335i Steering Wheel Controls Demo Video
JB4 Optional In Dash Boost Gauge / Shift Light Demo
JB4 Optional Startup Gauge Sweep
E-N55-JB4-B (Harness B) - 26 x 16 x 6 cm
E-N55-JB4-B (Harness B) - 525 g