JB4 Tuner for 2015+ Mercedes-Benz

JB4 Tuner for 2015+ Mercedes-Benz

Regular price
Sale price
Regular price
Sold out
Unit price

Shipping calculated at checkout.

  • This quick install plug and play tuner connects to easy to reach plugs on top of the engine and safely increases turbocharger output by 3-6psi producing significant power and torque increases. Timing and fueling are appropriately rescaled for the increased boost and the installation is completely reversible in seconds. Compatible with all wheel drive and rear wheel drive models. The JB4 is the only tuning system that includes CANbus and optional BCM connections providing dramatically improved performance and smoothness over other 2-channel tuning systems.

    Power gains are up to 50whp for the C300, up to 60whp for the C400/C450, and up to 70whp for the C43. On racing fuel or E85 mixtures even higher gains are possible.

    Note 2019+ C300 models have changed to new SENT pressure sensors and require a unique JB4 system. Right now we believe all other 2019+ systems C400, C450, C43, etc, continue to use the older pressure sensors but expect at some point in the future they will also migrate over. We'll update the model year compatibility details as we receive them. M264

    Please be sure to visit for the latest map guide, firmware updates, installation directions, and notes.

    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. Separate JB4 Mobile app purchase also required.


    Mercedes-Benz JB4


    • Power gains range from 30-60whp on pump gas and much more on higher octane or E85 mixtures.
    • Improves 0-60 times and 1/4 mile times
    • The JB4 offers a lot more performance, functionality, and safety than your average performance chip
    • Quick Plug & Play Installation
    • Includes the rugged JB4 billet aluminum enclosure for protection
    • 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



    • 2018+ A250 W177
    • 2018+ A220 W177

    • 2014+ B250

    • 2014+ CLA 250 C117
    • 2015+ CLS 400 W218
    • 2015+ C200 W205
    • 2015+ C200 W205
    • 2015+ C250 W205
    • 2015-2018 C300 W205
    • 2014+ C400 W205
    • 2015+ C43 AMG W205
    • 2015+ C450 W205

    • 2016+ E300 W212
    • 2017+ E300 W213
    • 2015+ E400 W212
    • 2015+ E43 AMG W212 

    • 2016+ GLE 250, 300, 350, 43 AMG
    • 2016+ GLC 250, 300, 43 AMG
    • 2015+ GLA 250

    SLC 43

    • 2015-2019 ML 400

    • 2016+ Metris Van W447
    • 2016+ V-Class Van W447
    • 2016+ Valente Van W447
    • 2016+ Viano Van

    JB4 FAQ


    C300 Dyno Charts


    C300 Dyno Charts



    C300 Dyno Charts


    C450 with BMS Stage 1

Net Orders Checkout

Item Price Qty Total
Subtotal $0.00

Shipping Address

Shipping Methods