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 driver's 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 in 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 set up 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! Made in the USA. 5-Year Warranty.
Wirelessly connect the JB4 to your Bluetooth 4.0 compatible iOS and Android device via the JB4 Mobile connect kit, or to your Windows laptop with the BMS data cable. Both options allow you to record and analyze vehicle and tuning data, change JB4 performance maps, and update JB4 firmware as we release free newer versions with updates, more powerful maps, and new features under development. A separate JB4 Mobile app purchase is also required.
Note: This item is not CARB (California Air Resource Board) exempt and is not legal for sale or use in the state of California.
• N54 Power gains of up to 100hp and 100tq to the wheels on a stock vehicle • Improves 0-60 times and 1/4 mile times • Preloaded with custom BMW tuning software and up to 8 maps for various fuel and modification levels • The JB4 offers a lot more performance, functionality, and safety than your average performance chip • Quick Plug & Play Installation • CANbus OBDII integration offering unrivaled tuning features and performance • Improved performance over non-integrated chip tunes • Runs as smoothly as stock. This is how your vehicle 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 • 91 octane fuel or better required for performance gains • Ethanol (E85) compatible tuning maps • Able to read/delete fault codes • Not VIN locked and can be removed without a trace and resold down the road • Made in the USA • Free USA Shipping • 5-year warranty
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
2008-2010 BMW E71 X6 xDrive35i
BMW Z Series
2009-2016 BMW Z4 sDrive35i/is
What is a JB4? The JB4 is a plug and play tune available for turbocharged vehicles. The JB4 tuner installs between your car's sensors and its DME/ECU (computer) and manipulates vehicle performance through these connections making your vehicle much faster. While it's not the only tuning system that operates this way, the JB4 separates itself from the competition with much more advanced connection points and processing, including CANbus, fuel & spark control, Bluetooth to your smartphone, and a variety of innovative and advanced features not possible with any other system. BMS regularly publishes free mapping and firmware updates adding performance and features as ongoing development allows. In addition, the JB4 system is not VIN-locked to your vehicle and can be quickly removed and swapped between cars or resold at a later time. Often imitated but never duplicated, the JB4 has been the gold standard in plug and play turbocharged performance tuning for over a decade.
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, Exhaust, BMS intake, BMS Flash, on 50% E85 fuel
We have a 7-day return policy, which means you have 7 days after receiving your item to request a return. There is a 15% restocking fee.
For turbos there is a 25% restock fee on canceled or returned orders
To be eligible for a return, your item must be in the same condition that you received it, unworn or unused, with tags, and in its original packaging. You’ll also need the receipt or proof of purchase.
To start a return, you can contact us at email@example.com. If your return is accepted, we’ll send you a return shipping label, as well as instructions on how and where to send your package. Items sent back to us without first requesting a return will not be accepted.
You can always contact us for any return question at firstname.lastname@example.org.
Damages and issues
Please inspect your order upon reception and contact us immediately if the item is defective, damaged or if you receive the wrong item, so that we can evaluate the issue and make it right.
Exceptions / non-returnable items
Certain types of items cannot be returned, custom products (such as special orders or personalized items),. We also do not accept returns for hazardous materials, flammable liquids, or gases. Please get in touch if you have questions or concerns about your specific item.
Unfortunately, we cannot accept returns on sale items or gift cards.
The fastest way to ensure you get what you want is to return the item you have, and once the return is accepted, make a separate purchase for the new item.
We will notify you once we’ve received and inspected your return, and let you know if the refund was approved or not. If approved, you’ll be automatically refunded on your original payment method. Please remember it can take some time for your bank or credit card company to process and post the refund too.
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