Burger Motorsports BMS JB4 Tuning Box - Plug & Play Piggyback ECU Chip for Mercedes-Benz 2.0T/3.0T Biturbo (C200 C250 C300 C400 C43 E300 E400 E43 GLA/GLC/GLE 250/300/43 A250 B250 V-Class/Metris) W205 W213 W177 - Bluetooth Optional Remap Alternative

Mercedes turbo power module by Burger Tuning - instant bhp and torque with JB4

Turn your Mercedes into the car it should have been from the factory with the renowned JB4 performance module. This smart piggyback upgrade lifts boost safely, refines fuelling and ignition, and delivers a serious step up in real-world pace without permanent ECU flashing. Expect noticeably stronger mid range punch, crisper throttle response and effortless overtakes, all while retaining smooth OEM manners for daily driving.

On standard pump fuel we typically see gains in the region of 30 to 60 wheel horsepower depending on map and model, with even more headroom on higher octane, race fuel or ethanol blends such as E30 to E85. We run the JB4 on our own cars and customer feedback is consistently the same - faster, smoother and more rewarding to drive.

Why choose this upgrade

• Big power per pound - proven dyno and road gains with stock-like drivability
• No ECU flash required - fully reversible plug-in solution using factory connectors
• CANbus integration for enhanced safety, data, map switching and fault code read or clear
• Compatible with rear wheel drive and 4MATIC all wheel drive
• Fuel economy unchanged during gentle cruising
• Works with OEM driving modes and retains all factory protections
• Optional Bluetooth or USB connectivity for live data, datalogging and on the fly adjustments
• Not VIN locked so it can be removed and resold later
• Made in the USA and backed by a 5 year BMS warranty

How it works

The JB4 connects to four easily accessed sensors on top of the engine via an OEM style harness. It precisely increases boost pressure by around 3 to 6 psi depending on the selected map, while rescaling fuelling and timing through CAN for a safe, reliable uplift in performance. Installation is straightforward, requires no cutting or coding and can be removed without a trace.

Mapping at a glance

• Map 0 - bypass mode
• Map 1 - mild increase suitable for 91 RON+ equivalent fuels
• Map 2 - stronger increase for 93 RON+ equivalent fuels
• Map 3 - user configured fixed boost profile
• Map 4 - stock power with CAN active for logging
• Map 5 - higher boost to redline for E30 or quality unleaded race fuel
• Map 6 - fully user adjustable over stock
• Map 7 - race map for suitable high-octane fuels

Add the Bluetooth Connect Kit or Data Cable to change maps, datalog and fine tune from your phone or laptop.

Vehicle fitment

C-Class W205 - C200, C250, C300 2015 to 2018, C400, C450 and C43 AMG coupe and saloon

E-Class W212 W213 - E300, E400 and E43 AMG

GLA, GLC, GLE - 250, 300 and 43 AMG variants

A-Class W177 - A220, A250 2018+

B-Class - B250

CLA C117 - CLA 250

SLC - SLC 43

ML - ML 400 2015 to 2019

Vans W447 - Metris, V-Class, Valente, Viano

Note for 2019+ C300 models: these use SENT pressure sensors and require a specific JB4 version. Other 2019+ platforms may change sensors over time. If unsure, contact us and we will confirm the correct kit.

Performance expectations

Typical uplift on UK pump fuel is approximately 30 to 60 whp depending on the chosen map and engine. Higher octane and ethanol blends can unlock further gains. The result on cars such as the W205 C43 is a stronger, more linear pull right through the rev range with a noticeable improvement in in-gear acceleration.

Professional fitting and support

Want it installed for you? MJ Modifications in Warwickshire can supply and fit. Email info@mjmodifications.co.uk for a quote and availability. We are happy to advise on map selection, accessories and setup for your goals.

For firmware updates, setup help and map notes, the official JB4 support forum has the latest guidance.

Compatibility check before dispatch

Provide your UK registration or the last 7 of your VIN at checkout and we will verify the correct application to ensure perfect fitment for your vehicle.

Part number and warranty

Part number: MB-JB4

Manufacturer: Burger Tuning - BMS

Warranty: 5 year BMS warranty

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