Description
Transform your Gen 2 B58-powered BMW into a high-performance machine with the JB4® 475 Wheel Horsepower Package—the ultimate bolt-on upgrade for your BMW M240i, M340i, or M440i. Designed to unlock the hidden power potential of your factory turbocharged inline-six, this package delivers up to 475 WHP with ease, thanks to the proven JB4 tuner and premium supporting mods.
This all-in-one performance bundle is engineered to work seamlessly with G-series B58 engines and requires no permanent modifications. Perfect for daily drivers and weekend racers alike, it includes the JB4 tuner, Bluetooth app control, upgraded cold air intake, and high-performance NGK spark plugs—all backed by industry-leading components from Burger Motorsports.
Enjoy lightning-fast throttle response, increased turbo spool, and consistent power gains—especially on E30 or full E85 blends with an optional Flex Fuel Kit. Plus, every package includes bonus enthusiast gear like the JB4 badge, license plate frame, and air vent phone mount.
Key Features & Benefits:
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Boosts power output to up to 475 WHP on Gen 2 B58 engines
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Plug-and-play JB4 tuning system with Bluetooth app support
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Enhanced intake airflow with choice of BMS B58 Cold Air Intakes
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Includes NGK 96206 Spark Plugs, pre-gapped with BMS tools
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Adds protection and performance with BMS Oil Catch Can
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Includes professional tools: gapper, socket, feeler gauge
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Bonus items: JB4 badge, license plate frame, phone mount
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Optional upgrades for handling and flex fuel capability available
What’s Included:
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JB4 B58 Performance Tuner
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JB4 Bluetooth Wireless Phone/Tablet Connect Kit
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Choice of BMS Cold Air Intake:
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BMS B58 Competition Cold Air Intake
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OR BMS Silicone Front Mount Intake
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BMS Turbo Double Baffle Oil Catch Can (G-Chassis)
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6x NGK 96206 B58 Spark Plugs
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BMS Billet Spark Plug Gapper Tool (12mm)
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BMW/MINI Magnetic Spark Plug Socket
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Specialty Spark Plug Feeler Gauge
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JB4 Logo Car Emblem/Badge
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JB4 License Plate Frame
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JB4 Magnetic Air Vent Phone Mount
Recommended Add-ons (Sold Separately):
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BMS Billet Strut Cross Braces for improved chassis rigidity
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BMS Billet Oil Filter Cap for long-term reliability
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Fuel-It! Bluetooth Flex Fuel Kit to unleash full E85 potential
Vehicle Fitment:
BMW 2 Series (G42)
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2022+ M240i, M240i xDrive, M240xi
BMW 3 Series (G20, G21) -
2019–2024 M340i, M340i xDrive, M340xi
BMW 4 Series (G22, G23, G26) -
2021–2024 M440i, M440i xDrive, M440xi (including Gran Coupe)
Dyno Proven Performance:
On the dyno, a stock Gen2 B58 M340i gains substantial WHP with JB4, cold air intake, and ethanol blends. Achieve consistent 475+ wheel horsepower with the right fueling and climate conditions.
The standard shipping rate applies to orders within the continental United States. If you intend to place an order outside of the continental US, please reach out to support@x-ph.com for assistance.
